ComposerDesktopProject/dev/science/tweet.c

/*
 * Copyright (c) 1983-2023 Trevor Wishart and Composers Desktop Project Ltd
 * http://www.trevorwishart.co.uk
 * http://www.composersdesktop.com
 *
 This file is part of the CDP System.
 
 The CDP System is free software; you can redistribute it
 and/or modify it under the terms of the GNU Lesser General Public
 License as published by the Free Software Foundation; either
 version 2.1 of the License, or (at your option) any later version.
 
 The CDP System is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU Lesser General Public License for more details.
 
 You should have received a copy of the GNU Lesser General Public
 License along with the CDP System; if not, write to the Free Software
 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
 02111-1307 USA
 *
 */
#include <stdio.h>
#include <stdlib.h>
#include <structures.h>
#include <tkglobals.h>
#include <pnames.h>
#include <filetype.h>
#include <processno.h>
#include <modeno.h>
#include <logic.h>
#include <globcon.h>
#include <cdpmain.h>
#include <math.h>
#include <mixxcon.h>
#include <osbind.h>
#include <standalone.h>
#include <science.h>
#include <ctype.h>
#include <sfsys.h>
#include <string.h>
#include <srates.h>

#define TWEET_PDATA 0
#define TWEET_MIN   1   
#define WINDIV (6.0)
#define FOFCOSWINDOW (.002)
#define MINSPEECHGLITCH (0.15)              // Assume minimum time for speaking voice to leap > 8va and back is > 150 mS
#define PITCHERROR (1.5)
#define ALMOST_OCT (1.9)

#ifdef unix
#define round(x) lround((x))
#endif
#ifndef HUGE
#define HUGE 3.40282347e+38F
#endif

char errstr[2400];

int anal_infiles = 1;
int sloom = 0;
int sloombatch = 0;

const char* cdp_version = "6.1.0";

//CDP LIB REPLACEMENTS
static int setup_tweet_application(dataptr dz);
static int parse_sloom_data(int argc,char *argv[],char ***cmdline,int *cmdlinecnt,dataptr dz);
static int parse_infile_and_check_type(char **cmdline,dataptr dz);
static int setup_tweet_param_ranges_and_defaults(dataptr dz);
static int handle_the_outfile(int *cmdlinecnt,char ***cmdline,dataptr dz);
static int setup_and_init_input_param_activity(dataptr dz,int tipc);
static int setup_input_param_defaultval_stores(int tipc,aplptr ap);
static int establish_application(dataptr dz);
static int initialise_vflags(dataptr dz);
static int setup_parameter_storage_and_constants(int storage_cnt,dataptr dz);
static int initialise_is_int_and_no_brk_constants(int storage_cnt,dataptr dz);
static int mark_parameter_types(dataptr dz,aplptr ap);
static int assign_file_data_storage(int infilecnt,dataptr dz);
static int get_tk_cmdline_word(int *cmdlinecnt,char ***cmdline,char *q);
static int get_the_process_no(char *prog_identifier_from_cmdline,dataptr dz);
static int get_the_mode_from_cmdline(char *str,dataptr dz);
static int setup_and_init_input_brktable_constants(dataptr dz,int brkcnt);
static int handle_the_special_data(int *cmdlinecnt,char ***cmdline,dataptr dz);
static int get_exclude_data(char *filename,dataptr dz);
static int extract_formant_shape(double *env,int segdur,int maxoutdur,dataptr dz);
static int recreate_tweet_sndbufs(dataptr dz);
static int create_tweet_sndbufs(dataptr dz);
static int silence_lolevel_fofs(int *outsegs,int *silence,int outcnt,dataptr dz);
static int smooth_cuts(int *cut,int *cutcnt,int cutstart,dataptr dz);
static int find_min_energy_downward_zero_crossing_point
            (int *n,int *trofpnt,int trofpntcnt,double *scanarray,int *cutcnt,int *cut,int cutstart,dataptr dz);
static int find_the_local_peaks(int *here,int *there,float *buf,int *n,int trofpntcnt,int *trofpnt,
            int *startsamp,int *endsamp,int losamp, int *cut, int cutcnt, double *localpeak, double *scanarray,
            int *localpeakcnt,int *first_downcross,dataptr dz);
static int  mark_cut(int *cutcnt,int *cut,int localpeakcnt,double *startarray,int here,int there,
             int startsamp,int first_downcross,double starttime,int msg,dataptr dz);
static int get_envelope_troughs(int *trofpnt,int *trofpntcnt,int envcnt,dataptr dz);
static int get_min_wsize(int *minwsize, dataptr dz);
static int extract_pitch_dependent_env_from_sndfile(int minwsize,int *maxwsize,dataptr dz);
static int check_tweet_param_validity_and_consistency(dataptr dz);
static int tweet_param_preprocess(dataptr dz);
static float getmaxsampr(int startsamp, int sampcnt,float *buffer);
static void smooth_oct_glitches(dataptr dz);
static int read_validpitch_wsize_in_samps_from_brktable(double thistime,int kk,dataptr dz);
static int count_zerocrossings(int here,int there,float *buf);
static int triangulate_env(int *here,int *there,int ideal_place,float *buf);
static int next_zero_cross(int here,dataptr dz);
static int previous_zero_cross(int here,int firstzero,dataptr dz);
static double autocorrelate(int n,int m,float *buf);
static int auto_correlate(int start,int *at,int end,int realend,int minlen,double pitchseg,int kk,dataptr dz);
static int next_down_zcross(int here,int hibound,float *buf);
static int last_down_zcross(int here,int lobound,float *buf);
static int silence_zero_signal_areas(int *outsegs,int *silence,int outcnt,dataptr dz);
static int impulse(int seglen,double time,dataptr dz);
static int tweet(dataptr dz);

/**************************************** MAIN *********************************************/

int main(int argc,char *argv[])
{
    int exit_status;
    dataptr dz = NULL;
    char **cmdline;
    int  cmdlinecnt;
    int n;
//    aplptr ap;
    int is_launched = FALSE;
    if(argc==2 && (strcmp(argv[1],"--version") == 0)) {
        fprintf(stdout,"%s\n",cdp_version);
        fflush(stdout);
        return 0;
    }
                        /* CHECK FOR SOUNDLOOM */
    if((sloom = sound_loom_in_use(&argc,&argv)) > 1) {
        sloom = 0;
        sloombatch = 1;
    }
    if(sflinit("cdp")){
        sfperror("cdp: initialisation\n");
        return(FAILED);
    }
                          /* SET UP THE PRINCIPLE DATASTRUCTURE */
    if((exit_status = establish_datastructure(&dz))<0) {                    // CDP LIB
        print_messages_and_close_sndfiles(exit_status,is_launched,dz);
        return(FAILED);
    }
    if(!sloom) {
        if(argc == 1) {
            usage1();   
            return(FAILED);
        } else if(argc == 2) {
            usage2(argv[1]);    
            return(FAILED);
        }
    }
    if(!sloom) {
        if((exit_status = make_initial_cmdline_check(&argc,&argv))<0) {     // CDP LIB
            print_messages_and_close_sndfiles(exit_status,is_launched,dz);
            return(FAILED);
        }
        cmdline    = argv;
        cmdlinecnt = argc;
        if((get_the_process_no(argv[0],dz))<0)
            return(FAILED);
        cmdline++;
        cmdlinecnt--;
        dz->maxmode = 3;
        if((exit_status = get_the_mode_from_cmdline(cmdline[0],dz))<0) {
            print_messages_and_close_sndfiles(exit_status,is_launched,dz);
            return(exit_status);
        }
        cmdline++;
        cmdlinecnt--;
        // setup_particular_application =
        if((exit_status = setup_tweet_application(dz))<0) {
            print_messages_and_close_sndfiles(exit_status,is_launched,dz);
            return(FAILED);
        }
        if((exit_status = count_and_allocate_for_infiles(cmdlinecnt,cmdline,dz))<0) {       // CDP LIB
            print_messages_and_close_sndfiles(exit_status,is_launched,dz);
            return(FAILED);
        }
    } else {
        //parse_TK_data() =
        if((exit_status = parse_sloom_data(argc,argv,&cmdline,&cmdlinecnt,dz))<0) {
            exit_status = print_messages_and_close_sndfiles(exit_status,is_launched,dz);
            return(exit_status);         
        }
    }
//    ap = dz->application;

    // parse_infile_and_hone_type() = 
    if((exit_status = parse_infile_and_check_type(cmdline,dz))<0) {
        exit_status = print_messages_and_close_sndfiles(exit_status,is_launched,dz);
        return(FAILED);
    }
    // setup_param_ranges_and_defaults() =
    if((exit_status = setup_tweet_param_ranges_and_defaults(dz))<0) {
        exit_status = print_messages_and_close_sndfiles(exit_status,is_launched,dz);
        return(FAILED);
    }
    // open_first_infile        CDP LIB
    if((exit_status = open_first_infile(cmdline[0],dz))<0) {    
        print_messages_and_close_sndfiles(exit_status,is_launched,dz);  
        return(FAILED);
    }
    cmdlinecnt--;
    cmdline++;

//  handle_extra_infiles() : redundant
    // handle_outfile() = 
    if((exit_status = handle_the_outfile(&cmdlinecnt,&cmdline,dz))<0) {
        print_messages_and_close_sndfiles(exit_status,is_launched,dz);
        return(FAILED);
    }

//  handle_formants()           redundant
//  handle_formant_quiksearch() redundant
//  handle_special_data ..........
    if((exit_status = handle_the_special_data(&cmdlinecnt,&cmdline,dz))<0) {
        print_messages_and_close_sndfiles(exit_status,is_launched,dz);
        return(FAILED);
    }
    if((exit_status = read_parameters_and_flags(&cmdline,&cmdlinecnt,dz))<0) {      // CDP LIB
        print_messages_and_close_sndfiles(exit_status,is_launched,dz);
        return(FAILED);
    }
//  check_param_validity_and_consistency....
    if((exit_status = check_tweet_param_validity_and_consistency(dz))<0) {
        print_messages_and_close_sndfiles(exit_status,is_launched,dz);
        return(FAILED);
    }
    //param_preprocess ......
    if((exit_status = tweet_param_preprocess(dz))<0) {
        print_messages_and_close_sndfiles(exit_status,is_launched,dz);
        return(FAILED);
    }
    is_launched = TRUE;
    dz->bufcnt = 3;
    if((dz->sampbuf = (float **)malloc(sizeof(float *) * (dz->bufcnt+1)))==NULL) {
        sprintf(errstr,"INSUFFICIENT MEMORY establishing sample buffers.\n");
        return(MEMORY_ERROR);
    }
    if((dz->sbufptr = (float **)malloc(sizeof(float *) * dz->bufcnt))==NULL) {
        sprintf(errstr,"INSUFFICIENT MEMORY establishing sample buffer pointers.\n");
        return(MEMORY_ERROR);
    }
    for(n = 0;n <dz->bufcnt; n++)
        dz->sampbuf[n] = dz->sbufptr[n] = (float *)0;
    dz->sampbuf[n] = (float *)0;

    if((exit_status = create_tweet_sndbufs(dz))<0) {
        print_messages_and_close_sndfiles(exit_status,is_launched,dz);
        return(FAILED);
    }
    //spec_process_file =
    if((exit_status = tweet(dz))<0) {
        print_messages_and_close_sndfiles(exit_status,is_launched,dz);
        return(FAILED);
    }
    if((exit_status = complete_output(dz))<0) {                                     // CDP LIB
        print_messages_and_close_sndfiles(exit_status,is_launched,dz);
        return(FAILED);
    }
    exit_status = print_messages_and_close_sndfiles(FINISHED,is_launched,dz);       // CDP LIB
    free(dz);
    return(SUCCEEDED);
}

/**********************************************
        REPLACED CDP LIB FUNCTIONS
**********************************************/


/****************************** SET_PARAM_DATA *********************************/

int set_param_data(aplptr ap, int special_data,int maxparamcnt,int paramcnt,char *paramlist)
{
    ap->special_data   = (char)special_data;       
    ap->param_cnt      = (char)paramcnt;
    ap->max_param_cnt  = (char)maxparamcnt;
    if(ap->max_param_cnt>0) {
        if((ap->param_list = (char *)malloc((size_t)(ap->max_param_cnt+1)))==NULL) {    
            sprintf(errstr,"INSUFFICIENT MEMORY: for param_list\n");
            return(MEMORY_ERROR);
        }
        strcpy(ap->param_list,paramlist); 
    }
    return(FINISHED);
}

/****************************** SET_VFLGS *********************************/

int set_vflgs
(aplptr ap,char *optflags,int optcnt,char *optlist,char *varflags,int vflagcnt, int vparamcnt,char *varlist)
{
    ap->option_cnt   = (char) optcnt;           /*RWD added cast */
    if(optcnt) {
        if((ap->option_list = (char *)malloc((size_t)(optcnt+1)))==NULL) {
            sprintf(errstr,"INSUFFICIENT MEMORY: for option_list\n");
            return(MEMORY_ERROR);
        }
        strcpy(ap->option_list,optlist);
        if((ap->option_flags = (char *)malloc((size_t)(optcnt+1)))==NULL) {
            sprintf(errstr,"INSUFFICIENT MEMORY: for option_flags\n");
            return(MEMORY_ERROR);
        }
        strcpy(ap->option_flags,optflags); 
    }
    ap->vflag_cnt = (char) vflagcnt;           
    ap->variant_param_cnt = (char) vparamcnt;
    if(vflagcnt) {
        if((ap->variant_list  = (char *)malloc((size_t)(vflagcnt+1)))==NULL) {
            sprintf(errstr,"INSUFFICIENT MEMORY: for variant_list\n");
            return(MEMORY_ERROR);
        }
        strcpy(ap->variant_list,varlist);       
        if((ap->variant_flags = (char *)malloc((size_t)(vflagcnt+1)))==NULL) {
            sprintf(errstr,"INSUFFICIENT MEMORY: for variant_flags\n");
            return(MEMORY_ERROR);
        }
        strcpy(ap->variant_flags,varflags);

    }
    return(FINISHED);
}

/***************************** APPLICATION_INIT **************************/

int application_init(dataptr dz)
{
    int exit_status;
    int storage_cnt;
    int tipc, brkcnt;
    aplptr ap = dz->application;
    if(ap->vflag_cnt>0)
        initialise_vflags(dz);    
    tipc  = ap->max_param_cnt + ap->option_cnt + ap->variant_param_cnt;
    ap->total_input_param_cnt = (char)tipc;
    if(tipc>0) {
        if((exit_status = setup_input_param_range_stores(tipc,ap))<0)             
            return(exit_status);
        if((exit_status = setup_input_param_defaultval_stores(tipc,ap))<0)        
            return(exit_status);
        if((exit_status = setup_and_init_input_param_activity(dz,tipc))<0)    
            return(exit_status);
    }
    brkcnt = tipc;
    //THERE ARE NO INPUTFILE brktables USED IN THIS PROCESS
    if(brkcnt>0) {
        if((exit_status = setup_and_init_input_brktable_constants(dz,brkcnt))<0)              
            return(exit_status);
    }
    if((storage_cnt = tipc + ap->internal_param_cnt)>0) {         
        if((exit_status = setup_parameter_storage_and_constants(storage_cnt,dz))<0)   
            return(exit_status);
        if((exit_status = initialise_is_int_and_no_brk_constants(storage_cnt,dz))<0)      
            return(exit_status);
    }                                                      
    if((exit_status = mark_parameter_types(dz,ap))<0)     
        return(exit_status);
    
    // establish_infile_constants() replaced by
    dz->infilecnt = 1;
    //establish_bufptrs_and_extra_buffers():
    return(FINISHED);
}

/********************** SETUP_PARAMETER_STORAGE_AND_CONSTANTS ********************/
/* RWD mallo changed to calloc; helps debug verison run as release! */

int setup_parameter_storage_and_constants(int storage_cnt,dataptr dz)
{
    if((dz->param       = (double *)calloc(storage_cnt, sizeof(double)))==NULL) {
        sprintf(errstr,"setup_parameter_storage_and_constants(): 1\n");
        return(MEMORY_ERROR);
    }
    if((dz->iparam      = (int    *)calloc(storage_cnt, sizeof(int)   ))==NULL) {
        sprintf(errstr,"setup_parameter_storage_and_constants(): 2\n");
        return(MEMORY_ERROR);
    }
    if((dz->is_int      = (char   *)calloc(storage_cnt, sizeof(char)))==NULL) {
        sprintf(errstr,"setup_parameter_storage_and_constants(): 3\n");
        return(MEMORY_ERROR);
    }
    if((dz->no_brk      = (char   *)calloc(storage_cnt, sizeof(char)))==NULL) {
        sprintf(errstr,"setup_parameter_storage_and_constants(): 5\n");
        return(MEMORY_ERROR);
    }
    return(FINISHED);
}

/************** INITIALISE_IS_INT_AND_NO_BRK_CONSTANTS *****************/

int initialise_is_int_and_no_brk_constants(int storage_cnt,dataptr dz)
{
    int n;
    for(n=0;n<storage_cnt;n++) {
        dz->is_int[n] = (char)0;
        dz->no_brk[n] = (char)0;
    }
    return(FINISHED);
}

/***************************** MARK_PARAMETER_TYPES **************************/

int mark_parameter_types(dataptr dz,aplptr ap)
{
    int n, m;                           /* PARAMS */
    for(n=0;n<ap->max_param_cnt;n++) {
        switch(ap->param_list[n]) {
        case('0'):  break; /* dz->is_active[n] = 0 is default */
        case('i'):  dz->is_active[n] = (char)1; dz->is_int[n] = (char)1;dz->no_brk[n] = (char)1; break;
        case('I'):  dz->is_active[n] = (char)1; dz->is_int[n] = (char)1;                         break;
        case('d'):  dz->is_active[n] = (char)1;                         dz->no_brk[n] = (char)1; break;
        case('D'):  dz->is_active[n] = (char)1; /* normal case: double val or brkpnt file */     break;
        default:
            sprintf(errstr,"Programming error: invalid parameter type in mark_parameter_types()\n");
            return(PROGRAM_ERROR);
        }
    }                               /* OPTIONS */
    for(n=0,m=ap->max_param_cnt;n<ap->option_cnt;n++,m++) {
        switch(ap->option_list[n]) {
        case('i'): dz->is_active[m] = (char)1; dz->is_int[m] = (char)1; dz->no_brk[m] = (char)1; break;
        case('I'): dz->is_active[m] = (char)1; dz->is_int[m] = (char)1;                          break;
        case('d'): dz->is_active[m] = (char)1;                          dz->no_brk[m] = (char)1; break;
        case('D'): dz->is_active[m] = (char)1;  /* normal case: double val or brkpnt file */     break;
        default:
            sprintf(errstr,"Programming error: invalid option type in mark_parameter_types()\n");
            return(PROGRAM_ERROR);
        }
    }                               /* VARIANTS */
    for(n=0,m=ap->max_param_cnt + ap->option_cnt;n < ap->variant_param_cnt; n++, m++) {
        switch(ap->variant_list[n]) {
        case('0'): break;
        case('i'): dz->is_active[m] = (char)1; dz->is_int[m] = (char)1; dz->no_brk[m] = (char)1; break;
        case('I'): dz->is_active[m] = (char)1; dz->is_int[m] = (char)1;                          break;
        case('d'): dz->is_active[m] = (char)1;                          dz->no_brk[m] = (char)1; break;
        case('D'): dz->is_active[m] = (char)1; /* normal case: double val or brkpnt file */      break;
        default:
            sprintf(errstr,"Programming error: invalid variant type in mark_parameter_types()\n");
            return(PROGRAM_ERROR);
        }
    }                               /* INTERNAL */
    for(n=0,
    m=ap->max_param_cnt + ap->option_cnt + ap->variant_param_cnt; n<ap->internal_param_cnt; n++,m++) {
        switch(ap->internal_param_list[n]) {
        case('0'):  break;   /* dummy variables: variables not used: but important for internal paream numbering!! */
        case('i'):  dz->is_int[m] = (char)1;    dz->no_brk[m] = (char)1;    break;
        case('d'):                              dz->no_brk[m] = (char)1;    break;
        default:
            sprintf(errstr,"Programming error: invalid internal param type in mark_parameter_types()\n");
            return(PROGRAM_ERROR);
        }
    }
    return(FINISHED);
}

/************************ HANDLE_THE_OUTFILE *********************/

int handle_the_outfile(int *cmdlinecnt,char ***cmdline,dataptr dz)
{
    int exit_status;
    char *filename = (*cmdline)[0];
    if(filename[0]=='-' && filename[1]=='f') {
        dz->floatsam_output = 1;
        dz->true_outfile_stype = SAMP_FLOAT;
        filename+= 2;
    }
    if(!sloom) {
        if(file_has_invalid_startchar(filename) || value_is_numeric(filename)) {
            sprintf(errstr,"Outfile name %s has invalid start character(s) or looks too much like a number.\n",filename);
            return(DATA_ERROR);
        }
    }
    strcpy(dz->outfilename,filename);      
    if((exit_status = create_sized_outfile(filename,dz))<0)
        return(exit_status);
    (*cmdline)++;
    (*cmdlinecnt)--;
    return(FINISHED);
}

/***************************** ESTABLISH_APPLICATION **************************/

int establish_application(dataptr dz)
{
    aplptr ap;
    if((dz->application = (aplptr)malloc(sizeof (struct applic)))==NULL) {
        sprintf(errstr,"establish_application()\n");
        return(MEMORY_ERROR);
    }
    ap = dz->application;
    memset((char *)ap,0,sizeof(struct applic));
    return(FINISHED);
}

/************************* INITIALISE_VFLAGS *************************/

int initialise_vflags(dataptr dz)
{
    int n;
    if((dz->vflag  = (char *)malloc(dz->application->vflag_cnt * sizeof(char)))==NULL) {
        sprintf(errstr,"INSUFFICIENT MEMORY: vflag store,\n");
        return(MEMORY_ERROR);
    }
    for(n=0;n<dz->application->vflag_cnt;n++)
        dz->vflag[n]  = FALSE;
    return FINISHED;
}

/************************* SETUP_INPUT_PARAM_DEFAULTVALS *************************/

int setup_input_param_defaultval_stores(int tipc,aplptr ap)
{
    int n;
    if((ap->default_val = (double *)malloc(tipc * sizeof(double)))==NULL) {
        sprintf(errstr,"INSUFFICIENT MEMORY for application default values store\n");
        return(MEMORY_ERROR);
    }
    for(n=0;n<tipc;n++)
        ap->default_val[n] = 0.0;
    return(FINISHED);
}

/***************************** SETUP_AND_INIT_INPUT_PARAM_ACTIVITY **************************/

int setup_and_init_input_param_activity(dataptr dz,int tipc)
{
    int n;
    if((dz->is_active = (char   *)malloc((size_t)tipc))==NULL) {
        sprintf(errstr,"setup_and_init_input_param_activity()\n");
        return(MEMORY_ERROR);
    }
    for(n=0;n<tipc;n++)
        dz->is_active[n] = (char)0;
    return(FINISHED);
}

/************************* SETUP_TWEET_APPLICATION *******************/

int setup_tweet_application(dataptr dz)
{
    int exit_status;
    aplptr ap;
    if((exit_status = establish_application(dz))<0)     // GLOBAL
        return(FAILED);
    ap = dz->application;
    // SEE parstruct FOR EXPLANATION of next 2 functions
    if(dz->mode == 2)
        exit_status = set_param_data(ap,0   ,4,2,"Dd00");
    else
        exit_status = set_param_data(ap,0   ,4,4,"DdID");
    if(exit_status<0)
        return(FAILED);
    if((exit_status = set_vflgs(ap,"",0,"","w",1,0,"0"))<0)
        return(FAILED);
    // set_legal_infile_structure -->
    dz->has_otherfile = FALSE;
    // assign_process_logic -->
    dz->input_data_type = SNDFILES_ONLY;
    dz->process_type    = UNEQUAL_SNDFILE;  
    dz->outfiletype     = SNDFILE_OUT;
    return application_init(dz);    //GLOBAL
}

/************************* PARSE_INFILE_AND_CHECK_TYPE *******************/

int parse_infile_and_check_type(char **cmdline,dataptr dz)
{
    int exit_status;
    infileptr infile_info;
    if(!sloom) {
        if((infile_info = (infileptr)malloc(sizeof(struct filedata)))==NULL) {
            sprintf(errstr,"INSUFFICIENT MEMORY for infile structure to test file data.");
            return(MEMORY_ERROR);
        } else if((exit_status = cdparse(cmdline[0],infile_info))<0) {
            sprintf(errstr,"Failed to parse input file %s\n",cmdline[0]);
            return(PROGRAM_ERROR);
        } else if(infile_info->filetype != SNDFILE)  {
            sprintf(errstr,"File %s is not of correct type\n",cmdline[0]);
            return(DATA_ERROR);
        } else if(infile_info->channels != 1)  {
            sprintf(errstr,"File %s is not of correct type (must be mono)\n",cmdline[0]);
            return(DATA_ERROR);
        } else if((exit_status = copy_parse_info_to_main_structure(infile_info,dz))<0) {
            sprintf(errstr,"Failed to copy file parsing information\n");
            return(PROGRAM_ERROR);
        }
        free(infile_info);
    }
    return(FINISHED);
}

/************************* SETUP_TWEET_PARAM_RANGES_AND_DEFAULTS *******************/

int setup_tweet_param_ranges_and_defaults(dataptr dz)
{
    int exit_status;
    aplptr ap = dz->application;
    // set_param_ranges()
    ap->total_input_param_cnt = (char)(ap->max_param_cnt + ap->option_cnt + ap->variant_param_cnt);
    // NB total_input_param_cnt is > 0 !!!
    if((exit_status = setup_input_param_range_stores(ap->total_input_param_cnt,ap))<0)
        return(FAILED);
    // get_param_ranges()
    ap->lo[TWT_PDAT]  = -2.0;           //  Pitch data
    ap->hi[TWT_PDAT]  = dz->nyquist;
    ap->default_val[TWT_PDAT] = 440.0;
    ap->lo[TWT_MIN]   = -60.0;
    ap->hi[TWT_MIN]   = 0.0;
    ap->default_val[TWT_MIN]  = 0.0;
    if(dz->mode != 2) {
        ap->lo[TWT_PKCNT] = 1;
        if(dz->mode == 1)
            ap->hi[TWT_PKCNT] = 4000;
        else
            ap->hi[TWT_PKCNT] = 200;
        ap->default_val[TWT_PKCNT] = 4;
        ap->lo[TWT_CHIRP] = 0;
        ap->hi[TWT_CHIRP] = 30;
        ap->default_val[TWT_CHIRP] = 0;
    }
    dz->maxmode = 3;
    if(!sloom)
        put_default_vals_in_all_params(dz);
    return(FINISHED);
}

/********************************* PARSE_SLOOM_DATA *********************************/

int parse_sloom_data(int argc,char *argv[],char ***cmdline,int *cmdlinecnt,dataptr dz)
{
    int exit_status;
    int cnt = 1, infilecnt;
    int filesize, insams, inbrksize;
    double dummy;
    int true_cnt = 0;
//    aplptr ap;

    while(cnt<=PRE_CMDLINE_DATACNT) {
        if(cnt > argc) {
            sprintf(errstr,"Insufficient data sent from TK\n");
            return(DATA_ERROR);
        }
        switch(cnt) {
        case(1):    
            if(sscanf(argv[cnt],"%d",&dz->process)!=1) {
                sprintf(errstr,"Cannot read process no. sent from TK\n");
                return(DATA_ERROR);
            }
            break;

        case(2):    
            if(sscanf(argv[cnt],"%d",&dz->mode)!=1) {
                sprintf(errstr,"Cannot read mode no. sent from TK\n");
                return(DATA_ERROR);
            }
            if(dz->mode > 0)
                dz->mode--;
            //setup_particular_application()=
            if((exit_status = setup_tweet_application(dz))<0)
                return(exit_status);
//            ap = dz->application;
            break;

        case(3):    
            if(sscanf(argv[cnt],"%d",&infilecnt)!=1) {
                sprintf(errstr,"Cannot read infilecnt sent from TK\n");
                return(DATA_ERROR);
            }
            if(infilecnt < 1) {
                true_cnt = cnt + 1;
                cnt = PRE_CMDLINE_DATACNT;  /* force exit from loop after assign_file_data_storage */
            }
            if((exit_status = assign_file_data_storage(infilecnt,dz))<0)
                return(exit_status);
            break;
        case(INPUT_FILETYPE+4): 
            if(sscanf(argv[cnt],"%d",&dz->infile->filetype)!=1) {
                sprintf(errstr,"Cannot read filetype sent from TK (%s)\n",argv[cnt]);
                return(DATA_ERROR);
            }
            break;
        case(INPUT_FILESIZE+4): 
            if(sscanf(argv[cnt],"%d",&filesize)!=1) {
                sprintf(errstr,"Cannot read infilesize sent from TK\n");
                return(DATA_ERROR);
            }
            dz->insams[0] = filesize;
            break;
        case(INPUT_INSAMS+4):
            if(sscanf(argv[cnt],"%d",&insams)!=1) {
                sprintf(errstr,"Cannot read insams sent from TK\n");
                return(DATA_ERROR);
            }
            dz->insams[0] = insams;
            break;
        case(INPUT_SRATE+4):
            if(sscanf(argv[cnt],"%d",&dz->infile->srate)!=1) {
                sprintf(errstr,"Cannot read srate sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_CHANNELS+4): 
            if(sscanf(argv[cnt],"%d",&dz->infile->channels)!=1) {
                sprintf(errstr,"Cannot read channels sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_STYPE+4):
            if(sscanf(argv[cnt],"%d",&dz->infile->stype)!=1) {
                sprintf(errstr,"Cannot read stype sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_ORIGSTYPE+4):
            if(sscanf(argv[cnt],"%d",&dz->infile->origstype)!=1) {
                sprintf(errstr,"Cannot read origstype sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_ORIGRATE+4):
            if(sscanf(argv[cnt],"%d",&dz->infile->origrate)!=1) {
                sprintf(errstr,"Cannot read origrate sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_MLEN+4):
            if(sscanf(argv[cnt],"%d",&dz->infile->Mlen)!=1) {
                sprintf(errstr,"Cannot read Mlen sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_DFAC+4):
            if(sscanf(argv[cnt],"%d",&dz->infile->Dfac)!=1) {
                sprintf(errstr,"Cannot read Dfac sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_ORIGCHANS+4):
            if(sscanf(argv[cnt],"%d",&dz->infile->origchans)!=1) {
                sprintf(errstr,"Cannot read origchans sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_SPECENVCNT+4):
            if(sscanf(argv[cnt],"%d",&dz->infile->specenvcnt)!=1) {
                sprintf(errstr,"Cannot read specenvcnt sent from TK\n");
                return(DATA_ERROR);
            }
            dz->specenvcnt = dz->infile->specenvcnt;
            break;
        case(INPUT_WANTED+4):
            if(sscanf(argv[cnt],"%d",&dz->wanted)!=1) {
                sprintf(errstr,"Cannot read wanted sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_WLENGTH+4):
            if(sscanf(argv[cnt],"%d",&dz->wlength)!=1) {
                sprintf(errstr,"Cannot read wlength sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_OUT_CHANS+4):
            if(sscanf(argv[cnt],"%d",&dz->out_chans)!=1) {
                sprintf(errstr,"Cannot read out_chans sent from TK\n");
                return(DATA_ERROR);
            }
            break;
            /* RWD these chanegs to samps - tk will have to deal with that! */
        case(INPUT_DESCRIPTOR_BYTES+4): 
            if(sscanf(argv[cnt],"%d",&dz->descriptor_samps)!=1) {
                sprintf(errstr,"Cannot read descriptor_samps sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_IS_TRANSPOS+4):  
            if(sscanf(argv[cnt],"%d",&dz->is_transpos)!=1) {
                sprintf(errstr,"Cannot read is_transpos sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_COULD_BE_TRANSPOS+4):    
            if(sscanf(argv[cnt],"%d",&dz->could_be_transpos)!=1) {
                sprintf(errstr,"Cannot read could_be_transpos sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_COULD_BE_PITCH+4):   
            if(sscanf(argv[cnt],"%d",&dz->could_be_pitch)!=1) {
                sprintf(errstr,"Cannot read could_be_pitch sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_DIFFERENT_SRATES+4): 
            if(sscanf(argv[cnt],"%d",&dz->different_srates)!=1) {
                sprintf(errstr,"Cannot read different_srates sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_DUPLICATE_SNDS+4):   
            if(sscanf(argv[cnt],"%d",&dz->duplicate_snds)!=1) {
                sprintf(errstr,"Cannot read duplicate_snds sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_BRKSIZE+4):  
            if(sscanf(argv[cnt],"%d",&inbrksize)!=1) {
                sprintf(errstr,"Cannot read brksize sent from TK\n");
                return(DATA_ERROR);
            }
            if(inbrksize > 0) {
                switch(dz->input_data_type) {
                case(WORDLIST_ONLY):
                    break;
                case(PITCH_AND_PITCH):
                case(PITCH_AND_TRANSPOS):
                case(TRANSPOS_AND_TRANSPOS):
                    dz->tempsize = inbrksize;
                    break;
                case(BRKFILES_ONLY):
                case(UNRANGED_BRKFILE_ONLY):
                case(DB_BRKFILES_ONLY):
                case(ALL_FILES):
                case(ANY_NUMBER_OF_ANY_FILES):
                    if(dz->extrabrkno < 0) {
                        sprintf(errstr,"Storage location number for brktable not established by CDP.\n");
                        return(DATA_ERROR);
                    }
                    if(dz->brksize == NULL) {
                        sprintf(errstr,"CDP has not established storage space for input brktable.\n");
                        return(PROGRAM_ERROR);
                    }
                    dz->brksize[dz->extrabrkno] = inbrksize;
                    break;
                default:
                    sprintf(errstr,"TK sent brktablesize > 0 for input_data_type [%d] not using brktables.\n",
                    dz->input_data_type);
                    return(PROGRAM_ERROR);
                }
                break;
            }
            break;
        case(INPUT_NUMSIZE+4):  
            if(sscanf(argv[cnt],"%d",&dz->numsize)!=1) {
                sprintf(errstr,"Cannot read numsize sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_LINECNT+4):  
            if(sscanf(argv[cnt],"%d",&dz->linecnt)!=1) {
                sprintf(errstr,"Cannot read linecnt sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_ALL_WORDS+4):    
            if(sscanf(argv[cnt],"%d",&dz->all_words)!=1) {
                sprintf(errstr,"Cannot read all_words sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_ARATE+4):    
            if(sscanf(argv[cnt],"%f",&dz->infile->arate)!=1) {
                sprintf(errstr,"Cannot read arate sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_FRAMETIME+4):    
            if(sscanf(argv[cnt],"%lf",&dummy)!=1) {
                sprintf(errstr,"Cannot read frametime sent from TK\n");
                return(DATA_ERROR);
            }
            dz->frametime = (float)dummy;
            break;
        case(INPUT_WINDOW_SIZE+4):  
            if(sscanf(argv[cnt],"%f",&dz->infile->window_size)!=1) {
                sprintf(errstr,"Cannot read window_size sent from TK\n");
                    return(DATA_ERROR);
            }
            break;
        case(INPUT_NYQUIST+4):  
            if(sscanf(argv[cnt],"%lf",&dz->nyquist)!=1) {
                sprintf(errstr,"Cannot read nyquist sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_DURATION+4): 
            if(sscanf(argv[cnt],"%lf",&dz->duration)!=1) {
                sprintf(errstr,"Cannot read duration sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_MINBRK+4):   
            if(sscanf(argv[cnt],"%lf",&dz->minbrk)!=1) {
                sprintf(errstr,"Cannot read minbrk sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_MAXBRK+4):   
            if(sscanf(argv[cnt],"%lf",&dz->maxbrk)!=1) {
                sprintf(errstr,"Cannot read maxbrk sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_MINNUM+4):   
            if(sscanf(argv[cnt],"%lf",&dz->minnum)!=1) {
                sprintf(errstr,"Cannot read minnum sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_MAXNUM+4):   
            if(sscanf(argv[cnt],"%lf",&dz->maxnum)!=1) {
                sprintf(errstr,"Cannot read maxnum sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        default:
            sprintf(errstr,"case switch item missing: parse_sloom_data()\n");
            return(PROGRAM_ERROR);
        }
        cnt++;
    }
    if(cnt!=PRE_CMDLINE_DATACNT+1) {
        sprintf(errstr,"Insufficient pre-cmdline params sent from TK\n");
        return(DATA_ERROR);
    }

    if(true_cnt)
        cnt = true_cnt;
    *cmdlinecnt = 0;        

    while(cnt < argc) {
        if((exit_status = get_tk_cmdline_word(cmdlinecnt,cmdline,argv[cnt]))<0)
            return(exit_status);
        cnt++;
    }
    return(FINISHED);
}

/********************************* GET_TK_CMDLINE_WORD *********************************/

int get_tk_cmdline_word(int *cmdlinecnt,char ***cmdline,char *q)
{
    if(*cmdlinecnt==0) {
        if((*cmdline = (char **)malloc(sizeof(char *)))==NULL)  {
            sprintf(errstr,"INSUFFICIENT MEMORY for TK cmdline array.\n");
            return(MEMORY_ERROR);
        }
    } else {
        if((*cmdline = (char **)realloc(*cmdline,((*cmdlinecnt)+1) * sizeof(char *)))==NULL)    {
            sprintf(errstr,"INSUFFICIENT MEMORY for TK cmdline array.\n");
            return(MEMORY_ERROR);
        }
    }
    if(((*cmdline)[*cmdlinecnt] = (char *)malloc((strlen(q) + 1) * sizeof(char)))==NULL)    {
        sprintf(errstr,"INSUFFICIENT MEMORY for TK cmdline item %d.\n",(*cmdlinecnt)+1);
        return(MEMORY_ERROR);
    }
    strcpy((*cmdline)[*cmdlinecnt],q);
    (*cmdlinecnt)++;
    return(FINISHED);
}


/****************************** ASSIGN_FILE_DATA_STORAGE *********************************/

int assign_file_data_storage(int infilecnt,dataptr dz)
{
    int exit_status;
    int no_sndfile_system_files = FALSE;
    dz->infilecnt = infilecnt;
    if((exit_status = allocate_filespace(dz))<0)
        return(exit_status);
    if(no_sndfile_system_files)
        dz->infilecnt = 0;
    return(FINISHED);
}



/************************* redundant functions: to ensure libs compile OK *******************/

int assign_process_logic(dataptr dz)
{
    return(FINISHED);
}

void set_legal_infile_structure(dataptr dz)
{}

int set_legal_internalparam_structure(int process,int mode,aplptr ap)
{
    return(FINISHED);
}

int setup_internal_arrays_and_array_pointers(dataptr dz)
{
    return(FINISHED);
}

int establish_bufptrs_and_extra_buffers(dataptr dz)
{
    return(FINISHED);
}

int read_special_data(char *str,dataptr dz) 
{
    return(FINISHED);
}

int inner_loop
(int *peakscore,int *descnt,int *in_start_portion,int *least,int *pitchcnt,int windows_in_buf,dataptr dz)
{
    return(FINISHED);
}

int get_process_no(char *prog_identifier_from_cmdline,dataptr dz)
{
    return(FINISHED);
}


/******************************** USAGE1 ********************************/

int usage1(void)
{
    usage2("tweet");
    return(USAGE_ONLY);
}

/******************************** DBTOLEVEL ***********************/

double dbtolevel(double val)
{
    int isneg = 0;
    if(flteq(val,0.0))
        return(1.0);
    if(val < 0.0) {
        val = -val;
        isneg = 1;
    }
    val /= 20.0;
    val = pow(10.0,val);
    if(isneg)
        val = 1.0/val;
    return(val);
}   

/********************************************************************************************/

int get_the_process_no(char *prog_identifier_from_cmdline,dataptr dz)
{
    if(!strcmp(prog_identifier_from_cmdline,"tweet"))               dz->process = TWEET;
    else {
        sprintf(errstr,"Unknown program identification string '%s'\n",prog_identifier_from_cmdline);
        return(USAGE_ONLY);
    }
    return(FINISHED);
}

/******************************** SETUP_AND_INIT_INPUT_BRKTABLE_CONSTANTS ********************************/

int setup_and_init_input_brktable_constants(dataptr dz,int brkcnt)
{   
    int n;
    if((dz->brk      = (double **)malloc(brkcnt * sizeof(double *)))==NULL) {
        sprintf(errstr,"setup_and_init_input_brktable_constants(): 1\n");
        return(MEMORY_ERROR);
    }
    if((dz->brkptr   = (double **)malloc(brkcnt * sizeof(double *)))==NULL) {
        sprintf(errstr,"setup_and_init_input_brktable_constants(): 6\n");
        return(MEMORY_ERROR);
    }
    if((dz->brksize  = (int    *)malloc(brkcnt * sizeof(int)))==NULL) {
        sprintf(errstr,"setup_and_init_input_brktable_constants(): 2\n");
        return(MEMORY_ERROR);
    }
    if((dz->firstval = (double  *)malloc(brkcnt * sizeof(double)))==NULL) {
        sprintf(errstr,"setup_and_init_input_brktable_constants(): 3\n");
        return(MEMORY_ERROR);                                                 
    }
    if((dz->lastind  = (double  *)malloc(brkcnt * sizeof(double)))==NULL) {
        sprintf(errstr,"setup_and_init_input_brktable_constants(): 4\n");
        return(MEMORY_ERROR);
    }
    if((dz->lastval  = (double  *)malloc(brkcnt * sizeof(double)))==NULL) {
        sprintf(errstr,"setup_and_init_input_brktable_constants(): 5\n");
        return(MEMORY_ERROR);
    }
    if((dz->brkinit  = (int     *)malloc(brkcnt * sizeof(int)))==NULL) {
        sprintf(errstr,"setup_and_init_input_brktable_constants(): 7\n");
        return(MEMORY_ERROR);
    }
    for(n=0;n<brkcnt;n++) {
        dz->brk[n]     = NULL;
        dz->brkptr[n]  = NULL;
        dz->brkinit[n] = 0;
        dz->brksize[n] = 0;
    }
    return(FINISHED);
}

/******************************** USAGE2 ********************************/

int usage2(char *str)
{
    if(!strcmp(str,"tweet")) {
        fprintf(stderr,
        "USAGE:\n"
        "tweet tweet 1 infile outfile exclude pitchdata minlevel pkcnt chirp [-w]\n"
        "tweet tweet 2 infile outfile exclude pitchdata minlevel frq chirp [-w]\n"
        "tweet tweet 3 infile outfile exclude pitchdata minlevel [-w]\n"
        "\n"
        "Replace FOFs in vocal sound by synthetic tweets or (mode 3) noise.\n"
        "\n"
        "PITCHDATA   A breakpoint file with time and frq information.\n"
        "            (Use \"repitch getpitch 2\").\n"
        "            May contain zeros (indicating moments of no-signal)\n"
        "            but it must contain SOME significant frequency information.\n"
        "EXCLUDE     Areas in src from which FOFs will NOT be extracted.\n"
        "            If not wanted, enter \"0\". Otherwise pairs of times in textfile.\n"
        "MINLEVEL    A level in dBs below level of loudest FOF found,\n"
        "            FOFs below this level rejected. NB Zero = NO FOFS rejected.\n"
        "PKCNT       Number of peaks in impulse. (1-200) (frq changes with FOF size)\n"
        "FRQ         Freq of peaks in impulse.   (1-200) (frq fixed).\n"
        "CHIRP       Glissing of impulse. (Range 0 to 30) (Care, output may clip).\n"
        "\n"
        "-w    FOFs are windowed (cosine smooth of edges)\n");
    } else
        fprintf(stdout,"Unknown option '%s'\n",str);
    return(USAGE_ONLY);
}

int usage3(char *str1,char *str2)
{
    fprintf(stderr,"Insufficient parameters on command line.\n");
    return(USAGE_ONLY);
}

/****************************** GET_MODE *********************************/

int get_the_mode_from_cmdline(char *str,dataptr dz)
{
    char temp[200], *p;
    if(sscanf(str,"%s",temp)!=1) {
        sprintf(errstr,"Cannot read mode of program.\n");
        return(USAGE_ONLY);
    }
    p = temp + strlen(temp) - 1;
    while(p >= temp) {
        if(!isdigit(*p)) {
            fprintf(stderr,"Invalid mode of program entered.\n");
            return(USAGE_ONLY);
        }
        p--;
    }
    if(sscanf(str,"%d",&dz->mode)!=1) {
        fprintf(stderr,"Cannot read mode of program.\n");
        return(USAGE_ONLY);
    }
    if(dz->mode <= 0 || dz->mode > dz->maxmode) {
        fprintf(stderr,"Program mode value [%d] is out of range [1 - %d].\n",dz->mode,dz->maxmode);
        return(USAGE_ONLY);
    }
    dz->mode--;     /* CHANGE TO INTERNAL REPRESENTATION OF MODE NO */
    return(FINISHED);
}

/************************* TWEET *******************************/

int tweet(dataptr dz)
{
    int exit_status;
/*  double maxenv = 10000.0;*/
    int n, m, k, j, cutcnt, ipos, trofpntcnt = 0;
    int outcnt, fofcnt,exclustt, excluend, maxoutdur=0, inbufstart, inbufend, obufpos, splen;
    int envcnt, minwsize, maxwsize = 0, bigarray, cutstart = 0, thiscut, lastcut=0;
    int segdur, segstart, segend;
    int *trofpnt, *cuttime, *outsegs, *excludes = NULL;
    double *scanarray, *env, srate = (double)dz->infile->srate;
    float *ibuf = dz->sampbuf[0], *obuf, *chpbuf;
    int *silence = NULL, done, init;
    int jj, kk;
    int cosedgelen = (int)round(FOFCOSWINDOW * dz->infile->srate);
    int min_fofsamps_for_windowing = (cosedgelen * 2) + 1;
    double *cosedge, val, time, splic;
    if((cosedge = (double *)malloc(cosedgelen * sizeof(double)))==NULL) {
        sprintf(errstr,"Insufficient memory for FOF windowing.\n");
        return(MEMORY_ERROR);
    }
    for(jj=0,kk=1;jj<cosedgelen;jj++,kk++) {
        val = (double)kk/(double)cosedgelen;
        val = (cos(val * PI) + 1.0)/2.0;
        cosedge[jj] = 1.0 - val;
    }
    if(dz->itemcnt > 0)                             //  Get exclude-data, if it is being used
        excludes = dz->lparray[0];

    if((exit_status = get_min_wsize(&minwsize,dz)) < 0)
        return exit_status;
    if(((envcnt = dz->insams[0]/minwsize) * minwsize)!=dz->insams[0])
        envcnt++;
    if((dz->env=(float *)malloc(((envcnt+20) * 2) * sizeof(float)))==NULL) {
        sprintf(errstr,"INSUFFICIENT MEMORY for envelope array.\n");
        return(MEMORY_ERROR);
    }
    bigarray = envcnt+20;
    memset(dz->env,0,(envcnt+20) * 2 * sizeof(float));  /* PRESET env VALS TO ZERO */
                    /* PART ENVELOPE vals CAN THEN BE STORED, where env-extract overlaps a buffer boundary */
    fprintf(stdout,"INFO: Extracting pitch-related envelope from file.\n");
    fflush(stdout);
    if((exit_status = extract_pitch_dependent_env_from_sndfile(minwsize,&maxwsize,dz))<0)
        return(exit_status);
    envcnt = dz->envend - dz->env;

    fprintf(stdout,"INFO: Locating envelope peaks.\n");
    fflush(stdout);
    if((trofpnt = (int *)malloc(envcnt/2 * sizeof(int)))==NULL) {
        sprintf(errstr,"INSUFFICIENT MEMORY TO ANALYSE ENVELOPE.\n");
        return(MEMORY_ERROR);
    }
    if((cuttime = (int *)malloc(bigarray/2 * sizeof(int)))==NULL) {
        sprintf(errstr,"INSUFFICIENT MEMORY TO ANALYSE ENVELOPE.\n");
        return(MEMORY_ERROR);
    }
    if((outsegs = (int *)malloc(bigarray * sizeof(int)))==NULL) {
        sprintf(errstr,"INSUFFICIENT MEMORY TO ANALYSE ENVELOPE.\n");
        return(MEMORY_ERROR);
    }
    if((silence = (int *)malloc(bigarray/2 * sizeof(int)))==NULL) {
        sprintf(errstr,"INSUFFICIENT MEMORY TO MARK SILENCES.\n");
        return(MEMORY_ERROR);
    }
    if((exit_status = get_envelope_troughs(trofpnt,&trofpntcnt,envcnt,dz))<0)
        return(exit_status);
    if((scanarray = (double *)malloc((maxwsize + 20) * sizeof(double)))==NULL) {
        sprintf(errstr,"Insufficient memory for array to scan for zero-crossings.\n");
        return(MEMORY_ERROR);
    }
    if((sndseekEx(dz->ifd[0],0,0)<0)){
        sprintf(errstr,"sndseek() failed\n");
        return SYSTEM_ERROR;
    }
    dz->total_samps_read = 0;
    if(sloom)
        display_virtual_time(dz->total_samps_read,dz);
    fprintf(stdout,"INFO: Calculating cut points.\n");
    fflush(stdout);
    if((exit_status = read_samps(ibuf,dz))<0)
        return(exit_status);
    k = 0;
    cutcnt = 0;
    if(dz->env[trofpnt[0]] <= 0.0)  /* if first trof is at zero, skip that one */
        k++;
    for(n = k;n<trofpntcnt;n++) {   /* find places to cut the source */
        if((exit_status = find_min_energy_downward_zero_crossing_point(&n,trofpnt,trofpntcnt,scanarray,&cutcnt,cuttime,cutstart,dz)) < 0)
            return(exit_status);
        if(!dz->zeroset)
            cutcnt++;
    }
    if((exit_status = smooth_cuts(cuttime,&cutcnt,cutstart,dz))<0)
        return(exit_status);

    n = 0;
    m = 0;
    thiscut = 0;
    done = 0;
    outcnt = 0;
    init = 0;

    if(dz->itemcnt > 0) {       // REMOVE FOFS IN EXCLUDED AREAS
        while(n < dz->itemcnt) {
            exclustt = excludes[m];
            excluend = excludes[m+1];
            while(cuttime[thiscut] < exclustt) {
                if(init) {
                    silence[outcnt/2] = 0;
                    outsegs[outcnt++] = cuttime[lastcut];
                    outsegs[outcnt++] = cuttime[thiscut];
                }
                lastcut = thiscut;
                init = 1;
                if(++thiscut >= cutcnt) {
                    done = 1;
                    break;
                }
            }
            if(done)
                break;
            silence[outcnt/2] = 1;
            outsegs[outcnt++] = cuttime[lastcut];                   //  Mark as silent
            while(cuttime[thiscut] < excluend) {
                thiscut++;
                if(thiscut >= cutcnt) {
                    done = 1;
                    break;
                }
            }
            if(done)
                break;
            outsegs[outcnt++] = cuttime[thiscut];
            lastcut = thiscut;
            if(++thiscut >= cutcnt)
                break;
            n++;
            m += 2;

        }
    }
    while(thiscut < cutcnt) {
        if(init) {
            silence[outcnt/2] = 0;
            outsegs[outcnt++] = cuttime[lastcut];
            outsegs[outcnt++] = cuttime[thiscut];
        }
        lastcut = thiscut;
        init = 1;
        thiscut++;
    }
    if((exit_status = silence_zero_signal_areas(outsegs,silence,outcnt,dz)) < 0)
        return(exit_status);
    if(dz->param[1] < 0.0) {
        if((exit_status = silence_lolevel_fofs(outsegs,silence,outcnt,dz)) < 0)
            return(exit_status);
    }
    fofcnt = outcnt/2;

    n = 0;
    maxoutdur = 0;
    for(n=0,j=0,k=1;n<fofcnt;n++,j+=2,k+=2)
        maxoutdur = max(outsegs[k] - outsegs[j],maxoutdur);
    dz->buflen = max(maxoutdur + 64,dz->buflen);                //  Recalc buflen for for output phase

    if((exit_status = recreate_tweet_sndbufs(dz))<0)
        return exit_status;

    ibuf   = dz->sampbuf[0];
    obuf   = dz->sampbuf[1];
    chpbuf = dz->sampbuf[2];
    
    if((env = (double *)malloc(maxoutdur * sizeof(double))) == NULL) {
        sprintf(errstr,"INSUFFICIENT MEMORY establishing level check array.\n");
        return(MEMORY_ERROR);
    }
    if((sndseekEx(dz->ifd[0],0,0)<0)){
        sprintf(errstr,"sndseek() failed\n");
        return SYSTEM_ERROR;
    }
    dz->total_samps_read = 0;
    if((exit_status = read_samps(ibuf,dz))<0)
        return(exit_status);
    inbufstart = 0;
    inbufend = dz->ssampsread;
    obufpos = 0;
    n = 0;
    j = 0;
    k = 1;
    time = 0.0;
    memset((char*)obuf,0,dz->buflen * sizeof(float));
    while(n<fofcnt) {
        segstart = outsegs[j];
        segend   = outsegs[k];
        segdur   = segend - segstart;
        if(silence[n]) {                //  Output silence
            for(jj=0;jj < segdur;jj++) {
                obuf[obufpos] = 0.0f;
                if(++obufpos >= dz->buflen) {
                    if((exit_status = write_samps(obuf,dz->buflen,dz))<0)
                        return exit_status;
                    obufpos = 0;
                }
            }
        } else {                                                                    //  Check we have all of segment in current inbuf
            if(segstart < inbufstart || segend >= inbufend) {                       //  and if not, get a new buffer
                if((sndseekEx(dz->ifd[0],segstart,0)<0)){
                    sprintf(errstr,"sndseek() failed\n");
                    return SYSTEM_ERROR;
                }
                dz->total_samps_read = segstart;
                if((exit_status = read_samps(ibuf,dz))<0)
                    return(exit_status);
                inbufstart = segstart;
            }
            ipos = segstart - inbufstart;
            segend = ipos + segdur;
            if(segend > dz->buflen) {
                sprintf(errstr,"FOF too long for buffer.\n");
                return(PROGRAM_ERROR);
            }
            memcpy((char*)chpbuf,(char*)(ibuf + ipos),segdur * sizeof(float));      //  Copy FOF to chpbuf

            if(dz->vflag[FOF_UNWIN]) {  //                                          //  If ness cosin-splice the FOF
                if(segdur >= min_fofsamps_for_windowing)
                    splen = cosedgelen;
                else
                    splen = segdur/2;
                for(jj = 0,kk = segdur - 1;jj < segdur;jj++,kk--) {
                    val = chpbuf[jj];
                    if(jj < splen) {
                        splic = (double)(jj+1)/(double)splen;
                        splic = (cos(splic * PI) + 1.0)/2.0;
                        splic = 1.0 - splic;
                        val *= splic;
                    } else if(kk < splen) {
                        splic = (double)(kk+1)/(double)splen;
                        splic = (cos(splic * PI) + 1.0)/2.0;
                        splic = 1.0 - splic;
                        val *= splic;
                    }
                    chpbuf[jj] = (float)val;
                }
            }
            if((exit_status = extract_formant_shape(env,segdur,maxoutdur,dz))<0)    //  Extract outer envelope of formant
                return exit_status;
            if((exit_status = impulse(segdur,time,dz))<0)                           //  Generate chirp to fit
                return exit_status;
            for(kk=0;kk<segdur;kk++)                                                //  superimpose formant shape on chirp
                chpbuf[kk] = (float)(chpbuf[kk] * env[kk]);
            
            for(jj=0;jj < segdur;jj++) {
                obuf[obufpos] = chpbuf[jj];
                if(++obufpos >= dz->buflen) {
                    if((exit_status = write_samps(obuf,dz->buflen,dz))<0)
                        return exit_status;
                    obufpos = 0;
                }
            }
        }
        n++;
        j += 2;
        k += 2;
        time = (double)(dz->total_samps_written + obufpos)/srate;
    }
    if(obufpos > 0) {
        if((exit_status = write_samps(obuf,obufpos,dz))<0)
            return(exit_status);
    }
    return FINISHED;
}

/************************* EXTRACT_PITCH_DEPENDENT_ENV_FROM_SNDFILE *******************************/

int extract_pitch_dependent_env_from_sndfile(int minwsize,int *maxwsize,dataptr dz)
{
    int exit_status;
    double tconvertor = 1.0/(double)dz->infile->srate;
    double fconvertor = (double)dz->infile->srate/WINDIV;
    int  start_samp = 0, envwindow_sampsize, big_envwindow_sampsize, here = 0, start_buf = 0;
    float *env = dz->env, *ibuf = dz->sampbuf[0], *ovflwbuf = dz->sampbuf[1];
    double time = 0.0;

    if((dz->ssampsread = fgetfbufEx(ibuf, dz->buflen * 2,dz->ifd[0],0)) < 0) {
        sprintf(errstr,"Can't read samples from input soundfile\n");        //  NB Uses a double length buf for reading envelope
        return(SYSTEM_ERROR);
    }
    if((exit_status = read_value_from_brktable(time,TWT_PDAT,dz))<0)
        return(exit_status);
    if(dz->param[TWT_PDAT] < 0.0)       /* no-pitch */
        envwindow_sampsize = minwsize;
    else
        envwindow_sampsize = (int)round(fconvertor/dz->param[TWT_PDAT]);
    while(here < dz->insams[0]) {
        if(here - start_buf >= dz->buflen) {
            memset((char *)ibuf,0,dz->buflen * sizeof(float));
            memcpy((char *)ibuf,(char *)ovflwbuf,dz->buflen * sizeof(float));
            start_buf += dz->buflen;
            if(dz->total_samps_read < dz->insams[0]) {
                if((dz->ssampsread = fgetfbufEx(ovflwbuf, dz->buflen,dz->ifd[0],0)) < 0) {
                    sprintf(errstr,"Can't read samples from input soundfile\n");
                    return(SYSTEM_ERROR);
                }
            }
        }   
        big_envwindow_sampsize = envwindow_sampsize * 2;
        *env++ = (float)time;
        if(here + big_envwindow_sampsize >= dz->insams[0]) {
            here -= envwindow_sampsize;
            big_envwindow_sampsize = dz->insams[0] - here;
            *env++ = getmaxsampr(start_samp,big_envwindow_sampsize,ibuf);
            break;
        }
        start_samp = here - start_buf;
        *env++ = getmaxsampr(start_samp,big_envwindow_sampsize,ibuf);
        here += envwindow_sampsize;
        time   = (float)(here * tconvertor);
        if((exit_status = read_value_from_brktable(time,TWT_PDAT,dz))<0)
            return(exit_status);
        if(dz->param[TWT_PDAT] < 0.0)       /* no-pitch */
            envwindow_sampsize = minwsize;
        else
            envwindow_sampsize = (int)round(fconvertor/dz->param[TWT_PDAT]);
        if(envwindow_sampsize > *maxwsize)
            *maxwsize = envwindow_sampsize;
    }
    *maxwsize *= 2; /* using overlapping windows */
    dz->envend = env;
    memset((char *)ibuf,0,dz->buflen * 2 * sizeof(float));
    return FINISHED;
}

/************************** GET_MIN_WSIZE **************************/

int get_min_wsize(int *minwsize, dataptr dz) {
    int n,m;
    int wsize;
    double fconvertor = (double)dz->infile->srate/WINDIV, frq;
    *minwsize = dz->insams[0];
    for(n=0,m=1;n<dz->brksize[TWEET_PDATA];n++,m+=2) {
        frq = dz->brk[TWEET_PDATA][m];
        if(frq > 0.0) {
            wsize = (int)round(fconvertor/frq);
            if(wsize < *minwsize)
                *minwsize = wsize;
        }
    }
    if(*minwsize >= dz->insams[0])
        return(DATA_ERROR);
    return FINISHED;
}

/******************************** GET_ENVELOPE_TROUGHS ********************************/

int get_envelope_troughs(int *trofpnt,int *trofpntcnt,int envcnt,dataptr dz)
{
    int n;
    int lasttrofpntcnt = 0, realtrofpntcnt = 0, reallasttrofpntcnt = 0;
    float lastenval;
    int zerotrof;
    trofpnt[0] = 0;
    n = 1;                      /* time-val pairs : vals are odd numbers */
    lastenval = dz->env[n];
    if(lastenval <= 0.0) {
        trofpnt[0] = 0;         /* mark start of zero trough */
        while(dz->env[n] <= 0.0) {
            n+= 2;
            if(n >= envcnt) {
                sprintf(errstr,"NO PEAKS FOUND IN ENVELOPE\n");
                return(GOAL_FAILED);
            }
        }
        n -= 2;
        if(n > 1)  {            /* if zero trough persists, also mark its end */
            trofpnt[1] = n-1;   /* times are even numbers : n is odd */
            lastenval = dz->env[n];
            *trofpntcnt = 1;
            lasttrofpntcnt = 1;
        }
        n += 2;
    } else {
        n += 2;
        while(n < envcnt) {         /* GET FIRST ENVELOPE TROUGH */
            if(dz->env[n] > lastenval) {
                trofpnt[0] = 0;
                lastenval = dz->env[n];
                n+=2;
                break;
            } else if (dz->env[n] < lastenval) {
                trofpnt[0] = n-1;   /* times are even numbers : n is odd */
                lastenval = dz->env[n];
                n+=2;
                break;
            }
            lastenval = dz->env[n];
            n+=2;
        }
    }
    if(n >= envcnt) {
        sprintf(errstr,"NO PEAKS FOUND IN ENVELOPE\n");
        return(GOAL_FAILED);
    }
    zerotrof = 0;
    while(n < envcnt) {         /* GET ENVELOPE TROUGHS */
        if(dz->env[n] > lastenval) {
            if(zerotrof) {                      /* mark and count end of a zero section */
                *trofpntcnt = lasttrofpntcnt + 1;
                trofpnt[*trofpntcnt] = n-3;     /* times are even numbers : n is odd; previous time is a zeroval */
                lasttrofpntcnt = *trofpntcnt;   /* count end-of-a-zero-section: but don't count as a real (new) trof */
                zerotrof = 0;               
            }
            *trofpntcnt = lasttrofpntcnt + 1;
            realtrofpntcnt = reallasttrofpntcnt + 1;
        } else if (dz->env[n] < lastenval) {    /* can't be in a zero block, as zero is min val */
            trofpnt[*trofpntcnt] = n-1;         /* times are even numbers : n is odd */
            lasttrofpntcnt = *trofpntcnt;
            reallasttrofpntcnt = realtrofpntcnt;
        } else if(dz->env[n] <= 0.0) {          /* dz->env[n] == previous value SO zero value is continued */
            zerotrof = 1;
        }
        lastenval = dz->env[n];
        n+=2;
    }
    if(realtrofpntcnt < 2) {
        sprintf(errstr,"NO SIGNIFICANT PEAKS FOUND IN ENVELOPE\n");
        return(GOAL_FAILED);
    }
    return(FINISHED);
}

/************************** FIND_MIN_ENERGY_DOWNWARD_ZERO_CROSSING_POINT **************************/

int find_min_energy_downward_zero_crossing_point(int *n,int *trofpnt,int trofpntcnt,
            double *scanarray,int *cutcnt,int *cut,int cutstart,dataptr dz)
{
    int exit_status;
    int check;
    float starttime, val, *buf = dz->sampbuf[0];
    int wsize, thissamp, hisamp, losamp, j, zc_cnt, at;
    int endsamp, startsamp, seglen;
    int newpos, diff, losampinbuf, hisampinbuf, here, there, localpeakcnt;
    int k, first_downcross, mindiff, goalseglen, newseglen, thiscut;
    double official_pitchlen;
    int pitchseg_lolimit, pitchseg_hilimit;
    int done;
    int pitchwindow, ideal_place, last_startsamp, thiscutinbuf, lastcut, lastcutinbuf;
    int seg1, seg2;
    double rat;
    endsamp = dz->total_samps_read;
    startsamp = endsamp - dz->ssampsread;
    j = trofpnt[*n];
    starttime = dz->env[j];
    wsize = read_validpitch_wsize_in_samps_from_brktable(starttime,0,dz);
    thissamp = (int)round(starttime * (double)dz->infile->srate);
    losamp = thissamp;
    if((exit_status = read_value_from_brktable(starttime,0,dz))<0)  /* get pitch at start of window */
        return(exit_status);
    if(losamp >= dz->insams[0])
        return(FINISHED);
    if(losamp >= endsamp || losamp < startsamp) {
        newpos = (losamp/F_SECSIZE) * F_SECSIZE;
        if((sndseekEx(dz->ifd[0],newpos,0)<0)){
            sprintf(errstr,"sndseek() failed\n");
            return SYSTEM_ERROR;
        }
        dz->total_samps_read = newpos;
        if((exit_status = read_samps(buf,dz))<0)
            return(exit_status);
        endsamp = dz->total_samps_read;
        startsamp = endsamp - dz->ssampsread;
    }
    hisamp = min(dz->insams[0],thissamp + wsize);   /* get end-of-search area from  wtime & half-wsize */
    if(hisamp >= dz->insams[0])
        hisamp = dz->insams[0];
    if(hisamp > endsamp) {
        newpos = (losamp/F_SECSIZE) * F_SECSIZE;            /* if end-of--search beyond end of current buf */
        /* adjust buffer to contain whole search area */
        if((sndseekEx(dz->ifd[0],newpos,0)<0)){
            sprintf(errstr,"sndseek() failed\n");
            return SYSTEM_ERROR;
        }
        dz->total_samps_read = newpos;
        if((exit_status = read_samps(buf,dz))<0)
            return(exit_status);
        endsamp = dz->total_samps_read;
        startsamp = endsamp - dz->ssampsread;
    }
    losampinbuf = losamp - startsamp;                   /* get search ends relative to buffer */
    hisampinbuf = hisamp - startsamp;
    if(dz->param[0] > 0) {
        pitchwindow = (int)round((double)dz->infile->srate/dz->param[0]);
        ideal_place = cut[(*cutcnt) - 1] + pitchwindow;
        ideal_place -= startsamp;
    } else {
        ideal_place = -1; 
    }
    here  = losampinbuf;
    there = hisampinbuf;
    zc_cnt = count_zerocrossings(losampinbuf,hisampinbuf,buf);
    while(zc_cnt > 5)   /* Divide segment into 4 quarters, making 3 overlapping areas, while any area has >= 5 zcrossings */
        zc_cnt = triangulate_env(&here,&there,ideal_place,buf); /* and find area with least energy */

    losamp = here + startsamp;

    dz->zeroset = 0;
    if((exit_status = find_the_local_peaks(&here,&there,buf,n,trofpntcnt,trofpnt,
         &startsamp,&endsamp,losamp,cut,*cutcnt,scanarray,scanarray,&localpeakcnt,&first_downcross,dz) )<0)
         return(exit_status);
    if(exit_status == FINISHED)
        dz->zeroset = 1;
    if(dz->zeroset)
        return(FINISHED);
    if((exit_status = mark_cut(cutcnt,cut,localpeakcnt,scanarray,here,there,startsamp,first_downcross,starttime,1,dz))<0)
        return(exit_status);
    if((*cutcnt)-1 < cutstart)      /* FIND LENGTH OF SEGMENT GENERATED */
        seglen = cut[*cutcnt];
    else
        seglen = cut[*cutcnt] - cut[(*cutcnt)-1];
    if(seglen == 0) {       /* ELIMINATE ZERO-LENGTH SEGMENTS (CUTS AT SAME TIME) */
        (*cutcnt)--;
    } else if(*cutcnt > cutstart && dz->param[0] > 0) {
                            /* CHECK THE LENGTH OF THE WINDOW AGAINST WHAT WE'D PREDICT FROM THE PITCH VALUE */ 
        check = 1;
        while(check) {
            official_pitchlen = (double)dz->infile->srate/dz->param[0];
            pitchseg_lolimit = (int)round(official_pitchlen/PITCHERROR);
            pitchseg_hilimit = (int)round(official_pitchlen * PITCHERROR);
                                            /* IF SEGLEN IS ACCEPTABLE, BREAK */
            if(seglen > pitchseg_lolimit && seglen < pitchseg_hilimit) {
                break;
            }
            if(seglen < pitchseg_lolimit) { /* TOO SHORT ITEM, DELETE FROM CUTLIST */
                (*cutcnt)--;
                break;
            }
                                    /* TOO int ITEM */
                    /* BRUTE FORCE METHOD, CUT AT ANY DOWN ZEROCROSS NEAR THE RIGHT TIME */
                            /* TRY TO MAKE A CUT HALF-WAY THROUGH THE SEGMENT */
            at = 0;
            mindiff = seglen;               
            goalseglen = seglen/2;                  /* set the goal segement length to half the current seglen */
                                                    /* Geteach zero-crossing in this segment */
            last_startsamp = -1;
            thiscutinbuf = cut[*cutcnt] - startsamp;
            lastcut = cut[(*cutcnt) - 1];
            lastcutinbuf = lastcut - startsamp;
            if(lastcutinbuf < 0) {
                last_startsamp = startsamp;
                if((sndseekEx(dz->ifd[0],lastcut,0)<0)){
                    sprintf(errstr,"sndseek() failed\n");
                    return SYSTEM_ERROR;
                }
                dz->total_samps_read = lastcut;
                if((exit_status = read_samps(buf,dz))<0)
                    return(exit_status);
                startsamp = dz->total_samps_read - dz->ssampsread;
                thiscutinbuf  -= lastcutinbuf;  /* lastcutinbuf is -ve */
                lastcutinbuf = 0;
            }
            done = 0;
            k = lastcutinbuf;
            val = buf[++k];
            while(k < thiscutinbuf) {
                if(val > 0.0) {
                    while(val >= 0.0) {
                        k++;
                        if(k >= thiscutinbuf) {
                            done = 1;
                            break;
                        }
                        val = buf[k];
                    }
                }
                if(done)
                    break;
                if(val < 0.0) {
                    newseglen = k - lastcutinbuf;
                    diff = newseglen - goalseglen;
                    if(abs(diff) < mindiff) {           /* if a segment cut from here is closer to the goallength, mark it */
                        mindiff = abs(diff);
                        at = k + startsamp;
                    } else if(diff > 0) {               /* if not closer, and already above goal length, finished */
                        break;
                    }
                    while(val < 0.0) {
                        k++;
                        if(k >= thiscutinbuf) {
                            done = 1;
                            break;
                        }
                        val = buf[k];
                    }
                }
                if(done)
                    break;
                if(val == 0.0) {
                    while(val == 0.0) {
                        k++;
                        if(k >= thiscutinbuf)
                            break;
                        val = buf[k];
                    }
                }
            }
            if(last_startsamp >= 0) {               /* rejiggle bufs */
                if((sndseekEx(dz->ifd[0],startsamp,0)<0)){
                    sprintf(errstr,"sndseek() failed\n");
                    return SYSTEM_ERROR;
                }
                dz->total_samps_read = startsamp;
                if((exit_status = read_samps(buf,dz))<0)
                    return(exit_status);
            }
            if(at) {                                /* if appropriate cutpoint found, mark it */
                seg1 = (at - startsamp) - lastcutinbuf;
                seg2 = thiscutinbuf - (at - startsamp);
                rat = (double)seg1/(double)seg2;
                if(rat  < 2.0 && rat > .5) {    /* if new cut is reasonable */
                    thiscut = cut[*cutcnt];     /* insert new cuts */
                    cut[*cutcnt] = at;
                    (*cutcnt)++;
                    cut[*cutcnt] = thiscut;
                }
            }
            break;
        }
    }
    return FINISHED;
}

/******************************** TRIANGULATE_ENV ********************************
 *
 * Segment divided into 4 quarters, to define 3 overlapping areas...
 *
 *           1st quarter  2nd quarter  3rd quarter  4th quarter
 *           ___________  ___________  ___________  ___________
 *          |           ||           ||           ||           |
 *
 *          |______Env0______________||_____Env2_______________|
 *
 *                       |_____Env1_______________|
 *
 *      Find area with minimum energy.
 */

int triangulate_env(int *here,int *there,int ideal_place,float *buf)
{
    int localhere = *here, localthere = *there;
    int seglen, this_zc_cnt[3], max_zc_cnt;
    int quartlen, quart[5], n, m;
    int  oversize, use_1st_quart = 0, use_last_quart = 0;
    double qsum[4], esum[3];
    seglen = localthere - localhere;
    quartlen = seglen/4;
    oversize = seglen - (quartlen * 4);
    if(*here > ideal_place)
        use_1st_quart = 1;
    if(*there < ideal_place)
        use_last_quart =1;
    if(oversize) {          /* func only called if >=5 zero crossings: so >= 9 samples: so 'there' never <= 'here' */
        localhere++;            /* truncate examined area by 1 sample */
        if(oversize > 1)
            localthere--;       /* truncate examined area by 1 more sample */
        if(oversize > 2)
            localhere++;        /* truncate examined area by 1 more sample */
    }
    quart[0] = localhere;       /* divide segment into 4 equal parts */
    for(n = 0; n < 4; n++)
        quart[n+1] = quart[n] + quartlen;
    if(use_1st_quart)
        max_zc_cnt = count_zerocrossings(quart[0],quart[2],buf);
    else if(use_last_quart)
        max_zc_cnt = count_zerocrossings(quart[2],quart[4],buf);
    else {
        max_zc_cnt = -1;
        for(n = 0; n < 3; n++) {    /* Find zcross count in each of 3 overalpping Envs */
            this_zc_cnt[n] = count_zerocrossings(quart[n],quart[n+2],buf);
            if(this_zc_cnt[n] > max_zc_cnt)
                max_zc_cnt = this_zc_cnt[n];
        }
    }
    if(max_zc_cnt < 5)          /* If none of the Env-segs has >= 5 zcrossings, return withot doing anything */
        return max_zc_cnt;      /* causing calling loop to finish */
    if(use_1st_quart) {
        *here  = quart[0];
        *there = quart[2];
        return max_zc_cnt;
    } else if(use_last_quart) {
        *here  = quart[2];
        *there = quart[4];
        return max_zc_cnt;
    }
    for(n = 0; n < 4; n++) {    /* Sum the abs-samples in each Quarter */
        qsum[n] = 0.0;
        for(m = quart[n];m <quart[n+1];m++)
            qsum[n] += fabs(buf[m]);
    }

    for(n = 0; n < 3; n++)      /* Sum the abs-samples in each Env */
        esum[n] = qsum[n] + qsum[n+1];

    if((flteq(esum[0],esum[1])) && (flteq(esum[0],esum[2]))) {  /* esums are all equal */
        if(this_zc_cnt[1] >= 5) {           /* return middle seg limits, unless too few zcrossings */
            *here  = quart[1];
            *there = quart[3];
            return this_zc_cnt[1];
        } else if(this_zc_cnt[0] >= 5) {    /* else return start seg limits, unless too few zcrossings */
            *here  = quart[0];
            *there = quart[2];
            return this_zc_cnt[0];
        } else {                            /* else return end seg limits */
            *here  = quart[2];
            *there = quart[4];
            return this_zc_cnt[2];
        }
    } else if((esum[0] <= esum[1]) && (esum[0] <= esum[2])) {   /* esum[0] in Env0 has minimum energy */
        if(this_zc_cnt[0] >= 5) {   /* If Env0 has > 5 zcrossings */
            *here  = quart[0];      /* define this as the new working segment in which to find min energy */                
            *there = quart[2];      /* Else return without doing anything */
        }                           /* (Calling process then drops out & uses segment we had at start of this func) */
        return this_zc_cnt[0];
    } else if((esum[1] <= esum[0]) && (esum[1] <= esum[2])) {   /* esum[1] in Env1 has minimum energy */
        if(this_zc_cnt[1] >= 5) {
            *here  = quart[1];
            *there = quart[3];
        }
        return this_zc_cnt[1];
    } /* else */                                                /* esum[2] in Env2 has minimum energy */
    if(this_zc_cnt[2] >= 5) {
        *here  = quart[2];
        *there = quart[4];
    }
    return this_zc_cnt[2];
}

/******************************** COUNT_ZEROCROSSINGS ********************************/

int count_zerocrossings(int here,int there,float *buf)
{
    int done = 0, isup = 0;
    int zc_cnt = 0;
    float val = buf[here];
    while(here < there) {
        while(flteq(val,0.0)) { /* only accessed if segment starts with zeros */
            here++;
            if(here >= there)  {
                done = 1;
                break;
            }
            val = buf[here];
        }
        if(done)
            break;
        while(val >= 0.0) {
            if(isup == -1)
                zc_cnt++;
            isup = 1;
            here++;
            if(here >= there) {
                done = 1;
                break;
            }
            val = buf[here];
        }
        if(done)
            break;
        while(val < 0.0) {
            if(isup == 1)
                zc_cnt++;
            isup = -1;
            here++;
            if(here >= there) {
                done = 1;
                break;
            }
            val = buf[here];
        }
    }
    return zc_cnt;
}

/******************************** FIND_THE_LOCAL_PEAKS ********************************/

int find_the_local_peaks(int *here,int *there,float *buf,int *n,int trofpntcnt,int *trofpnt,
         int *startsamp,int *endsamp,int losamp, int *cut, int cutcnt, double *localpeak, double *scanarray,
         int *localpeakcnt,int *first_downcross,dataptr dz)
{
    int exit_status, notfound = 0, finished = 0, /*below,*/ bufinc = 0;
    int maxat=0;
    float maxval=0.0f, val;
    int wsize, hisamp,losampinbuf,hisampinbuf;
    int orighere, origthere;
    *first_downcross = -1;
    wsize = *there - *here;
    while(!finished) {
        hisamp = min(dz->insams[0],losamp + wsize);     /* get end-of-search area from  wtime & half-wsize */
        if(hisamp >= dz->insams[0])
            hisamp = dz->insams[0];
        losampinbuf = losamp - *startsamp;                  /* get search ends relative to buffer */
        hisampinbuf = hisamp - *startsamp;
        if(hisampinbuf >= dz->buflen) {
            if((sndseekEx(dz->ifd[0],losamp,0)<0)){
                sprintf(errstr,"sndseek() failed\n");
                return SYSTEM_ERROR;
            }
            dz->total_samps_read = losamp;
            if((exit_status = read_samps(dz->sampbuf[0],dz))<0)
                return(exit_status);
            *endsamp = dz->total_samps_read;
            *startsamp = *endsamp - dz->ssampsread;
            losampinbuf = losamp - *startsamp;                  /* get search ends relative to buffer */
            hisampinbuf = hisamp - *startsamp;
            bufinc = 0;
        }
        *here = losampinbuf;
        /* IGNORE EDGES OF WINDOW before the first, and after the last, zero crossing */
                    /* MOVE START SEARCH TO FIRST ZERO CROSSING */
        if(!bufinc) {
            val = buf[*here];
            *first_downcross = -1;
            if(val >= 0.0) {
                while(val >= 0.0) {
                    (*here)++;
                    if(*here >= hisampinbuf) {
                        notfound = 1;                           /* no zero-cross found */
                        break;
                    }
                    val = buf[*here];
                }                                               
                if(notfound) {
                    wsize += 20;                                /* no zero-cross found, return to loop head */
                    bufinc = 1;
                    continue;                                   /* and move end of search window */
                }
            // VAL is just after zero cross downwards
                *first_downcross = *here;                   /* mark 1st down-zerocross in search area */
            } else if (val <= 0.0) {
                while(val <= 0.0) {
                    (*here)++;
                    if(*here >= hisampinbuf) {
                        notfound = 1;                           /* no zero-cross found */
                        break;
                    }
                    val = buf[*here];
                }
                if(notfound) {
                    wsize += 20;                                /* no zero-cross found, return to loop head */
                    bufinc = 1;
                    continue;   
                }
                // VAL is just after zero cross upwards
            }
        }
                    /* MOVE END OF SEARCH TO LAST ZERO CROSSING */
        *there = hisampinbuf - 1;
        val = buf[*there];
        if(val >= 0.0) {
//            below = 0;
            while(val >= 0.0) {
                (*there)--;
                if(*there < losampinbuf) {
                    break;
                }
                val = buf[*there];
            }
        } else if(val <= 0.0) {
//            below = 1;
            while(val <= 0.0) {
                (*there)--;
                if(*there < losampinbuf) {
                    break;
                }
                val = buf[*there];
            }
        }
        if(*there <= *here) {                               /* There is ONLY ONE zero-crossing found */
            if(buf[*here] >= 0.0) {                         /* This is an upward-crossing zero, NOT a downward crossing zero */
                notfound = 1;                               /* no DOWN-zero-cross found, return to loop head */
                wsize += 20;
                bufinc = 1;
                continue;                                   /* and move end of search window */
            }
            cut[cutcnt] = *here + *startsamp;               /* return the single downward-crossing zero */
            *first_downcross = *here;
            dz->zeroset = 1;
            return FINISHED;
        }                                                   /* ELSE more than one zero-cross found */
                                                            /* therefore at least one intervening (+ or -) peak  exists */
        (*there)++;                                         /* move end search to the value AFTER the last zero-crossing */
        finished = 1;                                       /* break from search loop */
    }
    orighere = *here;
    origthere = *there;
                /* STORE PEAKS BETWEEN ZERO-CROSSINGS */
    val = buf[*here];
    while(*here < *there) {
        if(val >= 0.0) {
            maxval = val;
            maxat = *here;
            while(val >= 0.0) {
                (*here)++;
                if(*here >= *there)
                    break;
                val = buf[*here];
                if(val > maxval) {
                    maxval = val;
                    maxat  = *here;
                }
            }
        } else if(val <= 0.0) {
            maxval = val;
            maxat = *here;
            while(val <= 0.0) {
                (*here)++;
                if(*here >= *there)
                    break;
                val = buf[*here];
                if(val < maxval) {
                    maxval = val;
                    maxat  = *here;
                }
            }
        }
        if(*first_downcross < 0)
            dz->zeroset = 1;
        if((maxval > 0.0) && (*first_downcross < 0))
            *first_downcross = *here;

        *localpeak++ = (double)maxval;
        *localpeak++ = (double)(maxat + *startsamp);
    }   
    *localpeakcnt = (localpeak - scanarray)/2;
    if(*localpeakcnt == 1) {
        if(!dz->zeroset) {          /* If only 1 peak, the cut points are at the first_downcross if NOT zeroset */
            *here = *first_downcross;
        } else {
            *here = orighere;       // REDUNDANT, as, if dz->zeroset then "mark_cut" is not called.
            *there = origthere;
        }
    }
    return CONTINUE;
}

/******************************** MARK_CUT ********************************/

int mark_cut(int *cutcnt,int *cut,int localpeakcnt,double *startarray,int here,int there,
             int startsamp,int first_downcross,double starttime,int msg,dataptr dz)
{
    double localpeak1, localpeak2, localpeak3, maxlocalpeak, minenergy, energy;
    int localpeakat1, localpeakat2 , at = 0, k, m, thissampinbuf;
    int up;
    double *localpeak = startarray;
    switch(localpeakcnt) {
    case(0):
        if(msg)
            sprintf(errstr,"FAILED TO LOCATE CUT POINT NEAR %lf secs: NO LOCAL PEAK FOUND: IMPOSSIBLE!!\n",starttime);
        return(PROGRAM_ERROR);
    case(1):                                        /* SINGLE PEAK */
        cut[*cutcnt] = here + startsamp;            /* return location of zero crossing after peak */
        break;
    case(2):                                        /* TWO PEAKS */
        if(*localpeak > 0.0) {                      /* FIRST PEAK IS ABOVE ZERO: find downcross after this */
            here = (int)round(*(localpeak+1));      /* location of 1st local peak */
            here -= startsamp;                      /* location in buf */
            here =  next_zero_cross(here,dz);       /* find following down-zerocross */
            cut[*cutcnt] =  here + startsamp;       /* return its absolute location */
        } else {                                    /* FIRST PEAK IS BELOW ZERO */
            if(fabs(*localpeak) < *(localpeak+2))   /* initial peak is lower energy */
                cut[*cutcnt] = here + startsamp;        /* return absolute-position of its start */
            cut[*cutcnt] = there + startsamp;       /*final peak is lower energy, return absolute-pos of its end */
        }
        break;
    case(3):
        localpeak1 = *localpeak++;                  /* THREE PEAKS */
        localpeakat1 = (int)round(*localpeak++);    /* Find location of (abs) max of the 3 */
        maxlocalpeak = *localpeak;
        at = 1;
        localpeak2 = *localpeak++;
        localpeakat2 = (int)round(*localpeak++);
        if(localpeak2 > maxlocalpeak) {
            maxlocalpeak = localpeak2;
            at = 2;
        }
        localpeak3 = *localpeak++;
        if(localpeak3 > maxlocalpeak) {
            maxlocalpeak = localpeak3;
            at = 3;
        }
        up = 0;                                     /* Is first peak +ve or -ve */
        if(localpeak1 > 0.0)
            up = 1;
        switch(at) {        /* Select on basis of where max peak is */
        case(1):            /* 1st peak is max */
            if(up) {
                cut[*cutcnt] = there + startsamp;               /* +ve cycle, return end of last peak */
            } else {
                here = localpeakat2 - startsamp;
                here = next_zero_cross(here,dz);                /* -ve cycle, return zero after peak2 */
                cut[*cutcnt] = here + startsamp;
            }
            break;
        case(2):            /* 2nd peak is max */
            if(localpeak1 > localpeak3) {               /* 3rd peak is minimum */
                if(up) {
                    cut[*cutcnt] = there + startsamp;           /* +ve cycle, return end of peak3 */
                } else {
                    here = localpeakat2 - startsamp;
                    here = next_zero_cross(here,dz);            /* -ve cycle, return start of peak3 */
                    cut[*cutcnt] = here + startsamp;
                }
            } else {                                    /* 1st peak is minimum */
                if(up) {
                    here = localpeakat1 - startsamp;
                    here = next_zero_cross(here,dz);            /* +ve cycle, return end of peak1 */
                    cut[*cutcnt] = here + startsamp;                    
                } else {
                    cut[*cutcnt] = here + startsamp;                /* -ve cycle, return start of peak1 */
                }
            }
            break;
        case(3):            /* 3rd peak is max */
            if(up) {
                here = localpeakat1 - startsamp;
                here = next_zero_cross(here,dz);                /* +ve cycle, return end of peak1 */
                cut[*cutcnt] = here + startsamp;
            } else {
                cut[*cutcnt] = here + startsamp;                    /* -ve cycle, return start of peak1 */
            }
            break;
        }
        break;
    default:                        /* MORE THAN 3 PEAKS */
        localpeak = startarray;
        minenergy = HUGE;                                       /* find minimum energy of each PAIR of peaks */
        for(k = 0,m = 2; m < localpeakcnt * 2; k+=2,m+=2) {
            energy = fabs(localpeak[k]) + fabs(localpeak[m]);
            if(energy < minenergy) {
                minenergy = energy;
                at = k;
            }
        }
        thissampinbuf  = (int)round(localpeak[at+1]);
        thissampinbuf -= startsamp;
        if(localpeak[at] > 0.0) {                               /* if min energy is at a pair that starts +ve */
            thissampinbuf = next_zero_cross(thissampinbuf,dz);
            cut[*cutcnt]   = thissampinbuf + startsamp;         /* return end of that pair's 1st peak */
        } else {
            thissampinbuf = previous_zero_cross(thissampinbuf,first_downcross,dz);
            cut[*cutcnt]   = thissampinbuf + startsamp;         /* else return start of that pair's 1st peak */
        }
    }
    return(FINISHED);
}

/***************************** SMOOTH_CUTS *****************************/

int smooth_cuts(int *cut,int *cutcnt,int cutstart,dataptr dz)
{
    int exit_status;
    int n, k, seg0, seg1, seg2, minseg, end, start, *thiscut, srchlen, minlen;
    int pitchseglim, pitchseglo=0, realend, lastcutval;
    double pitchseg, lastpitchseg=0.0, time, big_seg, this_seg, last_seg, big_int, this_int, last_int;
    int last_cut, this_cut, next_cut;
    double last_ratio, next_ratio;

    if((sndseekEx(dz->ifd[0],0,0)<0)){
        sprintf(errstr,"sndseek() failed\n");
        return SYSTEM_ERROR;
    }
    dz->total_samps_read = 0;
    if((exit_status = read_samps(dz->sampbuf[0],dz))<0)
        return(exit_status);
    for(n=3 + cutstart;n<*cutcnt;n++) {
        lastcutval = 0;
        end     = cut[n];
        realend = end;
        time = (double)cut[n-3]/(double)dz->infile->srate;
        if((exit_status = read_value_from_brktable(time,0,dz))<0)
            return(exit_status);                                    /* Get pitch at start of cut segment */
        if(dz->param[0] > 0.0) {                                    /* if it's a true pitch ... */
            pitchseg = (double)dz->infile->srate/dz->param[0];      /* Find corresponding segment length */
            pitchseglim = (int)round(pitchseg * ALMOST_OCT);        /* Go to almost an 8va up */
            pitchseglo  = (int)round(pitchseg/ALMOST_OCT);          /* Go to almost an 8va down */
            pitchseglim += cut[n-3];                                /* Prevent autocorrelation-search going beyond 8va */
            if(end > pitchseglim) {                                 
                end = pitchseglim;                                  /* Typically, end of search is ~2* expected pitchseg len */
                lastcutval = cut[n-2];                              /* & we save origval in case new val is to be INTERPOLATED. */
            }                                                       /* But if 3segs is smaller, set endofsearch to  endof 3segs */
        } else
            pitchseg = -1.0;
        start   = cut[n-3];
        thiscut = &(cut[n-2]);
        seg0    = cut[n-2] - cut[n-3];
        seg1    = cut[n-1] - cut[n-2];
        seg2    = cut[n]   - cut[n-1];
        minseg = min(seg0,seg1);
        minseg = min(minseg,seg2);
        srchlen = cut[n]   - cut[n-3];
        if((minlen = minseg/2) <= 0)            /* if previous segs tiny, e.g. just 1 seg, this val gets 0 */
            minlen = min(srchlen/6,pitchseglo); /* use either ~8va below pitch, or half the average of 3seglen */
        if(n >= 3) {
            last_cut = cut[n-2] - cut[n-3];
            this_cut = cut[n-1] - cut[n-2];
            next_cut = cut[n]   - cut[n-1];
            if(((last_cut > this_cut) && (next_cut > this_cut)) || ((last_cut < this_cut) && (next_cut < this_cut))) {
                if(last_cut > this_cut) {
                    last_ratio = (double)last_cut/(double)this_cut;
                    next_ratio = (double)next_cut/(double)this_cut;
                } else {
                    last_ratio = (double)this_cut/(double)last_cut;
                    next_ratio = (double)this_cut/(double)next_cut;
                }
                if((last_ratio > 1.3) || (next_ratio > 1.3)) {
                    if((exit_status = auto_correlate(start,thiscut,end,realend,minlen,pitchseg,0,dz))<0)
                        return(exit_status);
                }
            }
        }
        if(cut[n-2] >= cut[n-1]) {      /* If next cut is now too near to new cut ... */
            for(k = n;k<*cutcnt;k++)    /* e.g. 0 20 30 40 --> 0 20 40 40 .... omit duplicate  */
                cut[k-1] = cut[k];      /* OR   0 20 30 40 --> 0 20 50 40 .... omit skipped val */
            (*cutcnt)--;
            n--;
        } else if(lastcutval > 0) {     /* If new cut will fit between previous, and original value here */
                                        /*  e.g. originally 20 [200] 220 240 --> 20 40 220 240 (200 stored as lastcutval) */
            if(lastcutval - cut[n-2] > pitchseglo) {
                for(k = *cutcnt;k>=n-1;k--) /* then reinsert orig val .... */
                    cut[k+1] = cut[k];      /*  e.g. 20 40 220 240  --> 20 40 200 220 240 */
                cut[n-1] = lastcutval;
                (*cutcnt)++;
            }
        }                               /* Eliminate segs that are 8va up (twice too short) */
        if((n > cutstart+3) && (lastpitchseg > 0.0) && (pitchseg > 0.0)) {
            pitchseg = (pitchseg + lastpitchseg)/2.0;
            this_seg = (double)(cut[n-2] - cut[n-3]);
            if((big_seg   = (double)(cut[n-2] - cut[n-4])) > pitchseg)
                big_int = big_seg/pitchseg;
            else
                big_int = pitchseg/big_seg;
            if(this_seg > pitchseg)
                this_int = this_seg/pitchseg;
            else
                this_int = pitchseg/this_seg;
            if((last_seg = (double)(cut[n-3] - cut[n-4])) > pitchseg)
                last_int = last_seg/pitchseg;
            else
                last_int = pitchseg/last_seg;
            if((big_int < this_int) && (big_int < last_int)) {
                for(k = n-2;k < *cutcnt;k++)
                    cut[k-1] = cut[k];
                (*cutcnt)--;
                n--;
            }
        }
        lastpitchseg = pitchseg;
    }
    return FINISHED;
}

/****************************** SILENCE_ZERO_SIGNAL_AREAS *********************************/

int silence_zero_signal_areas(int *outsegs,int *silence,int outcnt,dataptr dz)
{
    double *frqdata = dz->brk[0];
    int n, segcnt = 0;
    int zeropnt[2]={0}, zerocnt = 0, brklen = dz->brksize[0] * 2, frqindx, timindx, nufrqindx, nutimindx;
    n = 0;
    timindx = 0;
    frqindx = 1;
    while (n < dz->brksize[0]) {
        zerocnt = 0;
        if(frqdata[frqindx] < 0.0) {
            zeropnt[0] = (int)round(frqdata[timindx] * (double)dz->infile->srate);
            zerocnt = 1;
            nufrqindx =frqindx + 2;
            nutimindx =timindx + 2;
            while(nufrqindx < brklen) {
                if(frqdata[nufrqindx] < 0.0) {  
                    zeropnt[1] = (int)round(frqdata[nutimindx] * (double)dz->infile->srate);
                    zerocnt = 2;
                    frqindx = nufrqindx;
                    timindx = nutimindx;
                    n++;
                    nufrqindx += 2;
                    nutimindx += 2;
                } else {
                    break;
                }
            }
            while(outsegs[segcnt] < zeropnt[0]) {
                if((segcnt+=2) >= outcnt)
                    return FINISHED;
            }
            segcnt-=2;
            silence[segcnt/2] = 1;
            if (zerocnt > 1) {
                while(outsegs[segcnt] <= zeropnt[1]) {
                    silence[segcnt/2] = 1;
                    segcnt += 2;
                    if(segcnt >= outcnt)
                        return FINISHED;
                }
                
            }
        }
        n++;
        timindx += 2;
        frqindx += 2;
    }
    return(FINISHED);
}

/****************************** SILENCE_LOLEVEL_FOFS *********************************/

int silence_lolevel_fofs(int *outsegs,int *silence,int outcnt,dataptr dz)
{
    int exit_status;
    int n, m, totalsamps = 0, endsegindx, levelcnt, ipos, levelsiz = (outcnt)/2;
    double maxsamp = 0.0, maxlocalsamp = 0.0, *level, lolim;
    float *ibuf = dz->sampbuf[0];
    if((level = (double *)malloc(levelsiz * sizeof(double))) == NULL) {
        sprintf(errstr,"INSUFFICIENT MEMORY establishing level check array.\n");
        return(MEMORY_ERROR);
    }
    if((sndseekEx(dz->ifd[0],0,0)<0)){
        sprintf(errstr,"sndseek() failed\n");
        return SYSTEM_ERROR;
    }
    dz->total_samps_read = 0;
    if((exit_status = read_samps(ibuf,dz))<0)
        return(exit_status);
    endsegindx = 1;
    levelcnt = 0;
    while(dz->ssampsread > 0) {
        ipos = 0;
        while(ipos < dz->ssampsread) {
            maxsamp = max(maxsamp,fabs(ibuf[ipos]));
            maxlocalsamp = max(maxlocalsamp,fabs(ibuf[ipos]));
            ipos++;
            totalsamps++;
            if(totalsamps >= outsegs[endsegindx]) {
                if(levelcnt < levelsiz) {
                    level[levelcnt++] = maxlocalsamp;
                    maxlocalsamp = 0.0;
                    endsegindx += 2;
                }
            }
        }
        if((exit_status = read_samps(ibuf,dz))<0)
            return(exit_status);
    }
    if((sndseekEx(dz->ifd[0],0,0)<0)){
        sprintf(errstr,"sndseek() failed\n");
        return SYSTEM_ERROR;
    }
    dz->total_samps_read = 0;
    if((exit_status = read_samps(ibuf,dz))<0)
        return(exit_status);
    lolim = maxsamp * dbtogain(dz->param[1]);
    n = 0;
    m = 0;
    while(n < outcnt) {
        if(level[m] < lolim)
            silence[m] = 1;
        n += 2;
        m++;
    }
    return(FINISHED);
}

/*************************** CREATE_TWEET_SNDBUFS **************************/

int create_tweet_sndbufs(dataptr dz)
{
    int bigbufsize;
    if(dz->sbufptr == 0 || dz->sampbuf==0) {
        sprintf(errstr,"buffer pointers not allocated: create_fofex_sndbufs()\n");
        return(PROGRAM_ERROR);
    }
    bigbufsize = (int)(size_t) Malloc(-1);
    dz->buflen = bigbufsize/sizeof(float);
    if((dz->bigbuf = (float *)malloc(bigbufsize * 2)) == NULL) {
        sprintf(errstr,"INSUFFICIENT MEMORY to create initial sound buffer.\n");
        return(PROGRAM_ERROR);
    }
    dz->sampbuf[0] = dz->bigbuf;                //  ibuf
    dz->sampbuf[1] = dz->bigbuf + dz->buflen;   //  ovflw
    return(FINISHED);
}

/*************************** RECREATE_TWEET_SNDBUFS **************************/

int recreate_tweet_sndbufs(dataptr dz)
{
    int n;
    int bigbufsize;
    free(dz->bigbuf);
    dz->bufcnt = 3;
    bigbufsize = (int)(size_t) Malloc(-1);
    bigbufsize = max(dz->buflen * sizeof(float),(unsigned int)bigbufsize);
    dz->buflen = bigbufsize/sizeof(float);
    if((dz->bigbuf = (float *)malloc(bigbufsize  * (dz->bufcnt+1))) == NULL) {
        sprintf(errstr,"INSUFFICIENT MEMORY to recreate sound buffers.\n");
        return(PROGRAM_ERROR);
    }
    for(n=0;n<dz->bufcnt;n++)
        dz->sbufptr[n] = dz->sampbuf[n] = dz->bigbuf + (dz->buflen * n);
    dz->sampbuf[n] = dz->bigbuf + (dz->buflen * n);
    return(FINISHED);
}

/*************************** EXTRACT_FORMANT_SHAPE **************************/

int extract_formant_shape(double *env,int segdur,int maxoutdur,dataptr dz)
{
    int phase = 0, maxposfirst, phasecnt;
    float *chpbuf = dz->sampbuf[2];
    double maxval, lastval, diff, frac, ratio;
    int n = 0, m, k, step, maxpos = 0, maxposend, lastpos;
    memset((char *)env,0,maxoutdur * sizeof(double));
    while(chpbuf[n] == 0.0) {
        n++;
        if(n >= segdur)
            return FINISHED;
    }
    if(chpbuf[n] > 0.0)
        phase = 1;
    else
        phase = -1;
    maxposfirst = -1;
    phasecnt = 0;
    maxval = 0.0;
    while(n < segdur) {
        switch(phase) {
        case(1):                                //  Find absolute maximum sample in a wavset
            if(chpbuf[n] > 0.0) {
                if(chpbuf[n] > maxval) {
                    maxval = chpbuf[n];
                    maxpos = n;
                }
            } else {
                if(fabs(chpbuf[n]) > maxval) {
                    maxval = fabs(chpbuf[n]);
                    maxpos = n;
                }
                phase = -phase;
                phasecnt++;
            }
            break;
        case(-1):
            if(chpbuf[n] < 0.0) {
                if(fabs(chpbuf[n]) > maxval) {
                    maxval = fabs(chpbuf[n]);
                    maxpos = n;
                }
            } else {
                if(chpbuf[n] > maxval) {
                    maxval = chpbuf[n];
                    maxpos = n;
                }
                phase = -phase;
                phasecnt++;
            }
            break;
        }
        if(phasecnt == 2) {
            if(maxposfirst < 0)
                maxposfirst = maxpos;
            env[maxpos] = maxval;           //  and store it in corresponding position in envelope
            maxval = 0.0;
            phasecnt = 0;
        }
        n++;
    }
    env[maxpos] = maxval;
    maxposend   = maxpos;
    k = 0;
    lastpos = 0;
    lastval = 0.0;
    n = 0;
    while(n < segdur) {                     //  Interpolate between stored (non-zero) vals
        if(env[n] > 0.0) {
            step = n - lastpos;
            diff = env[n] - lastval; 
            for(m= 0,k = lastpos;m < step; k++,m++) {
                ratio = (double)m/(double)step;
                frac = diff * ratio;
                env[k] = lastval + frac;
            }
            lastval = env[n];
            lastpos = n;
        }
        n++;
    }
    step = n - lastpos;                     //  Interpolate down to zero end
    diff = 0.0 - lastval; 
    for(m= 0,k = lastpos;m < step; k++,m++) {
        ratio = (double)m/(double)step;
        frac = diff * ratio;
        env[k] = lastval + frac;
    }
    for(n=0;n < maxposfirst;n++)            //  Check start and end to see if signal rises above interpolated envelope vals
        env[n] = max(env[n],fabs(chpbuf[n]));
    for(n=maxposend;n < segdur;n++)
        env[n] = max(env[n],fabs(chpbuf[n]));
    return FINISHED;
}

/******************************** IMPULSE ********************************/

int impulse(int seglen,double time,dataptr dz)
{
    int exit_status;
    int n, m, k, pkts = 0, impulse_halflen;
    float *chpbuf = dz->sampbuf[2];
    double sharpness, range, val, maxsamp, normaliser, srate = (double)dz->infile->srate;
    double halfsum, sumup, sumdn, adjustup, adjustdn;

    memset((char *)chpbuf,0,dz->buflen * sizeof(float));
    if((exit_status = read_values_from_all_existing_brktables(time,dz))<0)
        return exit_status;
    impulse_halflen  = seglen/2;
    if(seglen < 4)
        return FINISHED;                        //  if seglen too short, "output" silence
    switch(dz->mode) {
    case(0):
        pkts = dz->iparam[TWT_PKCNT];
        break;
    case(1):
        pkts = (int)round((double)dz->iparam[TWT_PKCNT] * ((double)seglen/srate));
        break;
    }
    maxsamp = 0.0;

    if(dz->mode == 2) {                         //  Noise
        sumup = 0.0;
        sumdn = 0.0;
        for(n = 0;n<impulse_halflen*2;n++) {
            val = (drand48() * 2.0) - 1.0;
            if(val > 0.0)
                sumup += val;
            else if (val < 0.0)
                sumdn -= val;
            chpbuf[n] = (float)val;
        }
        halfsum = (sumup + sumdn)/2.0; 
        adjustup = halfsum/sumdn;
        adjustdn = halfsum/sumdn;
        for(n = 0;n<impulse_halflen*2;n++) {
            if(chpbuf[n] > 0.0)
                chpbuf[n] = (float)(chpbuf[n] * adjustup);
            else if(chpbuf[n] < 0.0)
                chpbuf[n] = (float)(chpbuf[n] * adjustdn);
            maxsamp = max(maxsamp,fabs(chpbuf[n]));
        }
        normaliser = 1.0/maxsamp;
    } else {
        if(seglen < pkts * 4)
            range = (double)(seglen/4);         //  A cycle must have at least 4 samples
        else
            range = (double)pkts;
        range *= PI;
        sharpness = 1.0/dz->param[TWT_CHIRP]; 
        for(n = 0,m=impulse_halflen,k=impulse_halflen-1;n<impulse_halflen;n++,m++,k--) {
            val = (double)n/(double)impulse_halflen;
            val = pow(val,sharpness);
            val *= range;
            val = sin(val);
            chpbuf[m] = (float)-val;
            chpbuf[k] = (float)val;
            maxsamp = max(maxsamp,fabs(chpbuf[k]));
        }
    }
    normaliser = 1.0/maxsamp;
    for(n=0;n < impulse_halflen * 2;n++)
        chpbuf[n] = (float)(chpbuf[n] * normaliser);
    return FINISHED;
}

/************************ HANDLE_THE_SPECIAL_DATA *********************/

int handle_the_special_data(int *cmdlinecnt,char ***cmdline,dataptr dz)
{
    int exit_status;
    if(!sloom) {
        if(*cmdlinecnt <= 0) {
            sprintf(errstr,"Insufficient parameters on command line.\n");
            return(USAGE_ONLY);
        }
    }
    if((exit_status = get_exclude_data((*cmdline)[0],dz))<0)
        return(exit_status);
    (*cmdline)++;       
    (*cmdlinecnt)--;
    return(FINISHED);
}

/*************************** GET_EXCLUDE_DATA ***********************/

int get_exclude_data(char *filename,dataptr dz)
{
    FILE *fp;
    double dummy = 0.0, lasttime, srate = (double)dz->infile->srate;
    int cnt, badcnt, *times;
    char temp[200], temp2[4], *q;
    if(sloom) {
        temp[0] = NUMERICVAL_MARKER;        //  Reads a zero instead of a filename
        temp[1] = ENDOFSTR;
        temp2[0] = filename[0];
        temp2[1] = ENDOFSTR;
        if(!strcmp(temp2,temp)) {
            dz->itemcnt = 0;
            return FINISHED;
        }
    } else {
        if(!strcmp(filename,"0")) {
            dz->itemcnt = 0;
            return FINISHED;
        }
    }
    if((fp = fopen(filename,"r"))==NULL) {
        sprintf(errstr, "Can't open file %s to read data.\n",filename);
        return(DATA_ERROR);
    }
    cnt = 0;
    badcnt = 0;
    lasttime = -1.0;
    while(fgets(temp,200,fp)==temp) {
        q = temp;
        if(*q == ';')   //  Allow comments in file
            continue;
        while(get_float_from_within_string(&q,&dummy)) {
            if(cnt == 0 && dummy < 0.0) {
                sprintf(errstr,"Time (%lf) is less than zero in file %s.\n",dummy,filename);
                return(DATA_ERROR);
            }
            if(dummy <= lasttime) {
                sprintf(errstr,"Times (%lf & %lf) in file %s are not in increasing order.\n",lasttime,dummy,filename);
                return(DATA_ERROR);
            }
            if(dummy > dz->duration) {
                badcnt++;           //  Rounding error could make a valid end-of-file time not exactly tally with "duration"
                if(badcnt > 1) {    //  So allow 1 overflow time, but not more than 1
                    sprintf(errstr,"Time (%lf),in file %s, is beyond end of infile (%lf).\n",dummy,filename,dz->duration);
                    return(DATA_ERROR);
                }
            }
            lasttime = dummy;
            cnt++;
        }
    }       
    if(cnt == 0) {
        sprintf(errstr,"No data in file %s\n",filename);
        return(DATA_ERROR);
    }
    if(((dz->itemcnt = cnt/2) * 2) != cnt) {
        sprintf(errstr,"Data not paired correctly in file %s\n",filename);
        return(DATA_ERROR);
    }
    if((dz->lparray[0] = (int *)malloc(cnt * sizeof(int)))==NULL) {
        sprintf(errstr,"INSUFFICIENT MEMORY for data in file %s.\n",filename);
        return(MEMORY_ERROR);
    }
    times = dz->lparray[0];
    rewind(fp);
    cnt = 0;
    while(fgets(temp,200,fp)==temp) {
        q = temp;
        if(*q == ';')   //  Allow comments in file
            continue;
        while(get_float_from_within_string(&q,&dummy))
            times[cnt++] = (int)round(dummy * srate);
    }       
    if(flteq(dummy,dz->duration))           //  Force any eof time to be at sample-end of infile
        times[cnt - 1] = dz->insams[0];
    if(fclose(fp)<0) {
        fprintf(stdout,"WARNING: Failed to close file %s.\n",filename);
        fflush(stdout);
    }
    return(FINISHED);
}

/******************************** TWEET_PARAM_PREPROCESS ********************************/

int tweet_param_preprocess(dataptr dz)
{
    int n, m;
    if(dz->brksize[TWT_CHIRP]) {                                            //  Divide by 10 then Convert to a power of 10  
        for(n=0,m=1;n < dz->brksize[TWT_CHIRP];n++,m+=2)                    //  Vals 0  10  20  30
            dz->brk[TWT_CHIRP][m] = pow(10.0,(dz->brk[TWT_CHIRP][m]/10.0)); //  ->   0  1   2   3
    } else                                                              //  ->   1  10  100 1000
        dz->param[TWT_CHIRP] = pow(10.0,(dz->param[TWT_CHIRP]/10.0));
    return FINISHED;
}

/**************************** CHECK_TWEET_PARAM_VALIDITY_AND_CONSISTENCY *****************************/

int check_tweet_param_validity_and_consistency(dataptr dz)
{
    if(dz->brksize[0] == 0) {
        sprintf(errstr,"PITCH PARAMETER MUST BE IN A BREAKPOINT FILE.\n");
        return(DATA_ERROR);
    }
    /* EXTRA SMOOTHING OF PITCH DATA */
    smooth_oct_glitches(dz);        
    return FINISHED;
}

/************************* SMOOTH_OCT_GLITCHES *******************/

void smooth_oct_glitches(dataptr dz)
{
    int n, m, jumpcnt, start, end, k, datalen, endtime_index, jump[2];
    int octglitch;
    double interval, *pitchdata = dz->brk[0], time[2];
    datalen = dz->brksize[0] * 2;
    endtime_index = datalen - 2;
    jumpcnt = 0;
    m = 1;
    n = 3;
    while(n < datalen) {
        interval = pitchdata[n]/pitchdata[m];
        if(interval > 2.0) {
            jump[jumpcnt] = n;
            time[jumpcnt] = pitchdata[n-1];
            jumpcnt++;
        }
        else if(interval < 0.5) {
            jump[jumpcnt] = -n;
            time[jumpcnt] = pitchdata[n-1];
            jumpcnt++;
        }
        if(jumpcnt == 2) {
            octglitch = 0;
            if((jump[0] < 0) && (jump[1] > 0)) {
                octglitch = -1;
            } else if((jump[0] > 0) && (jump[1] < 0) ) {
                octglitch = 1;
            }
            if(octglitch && (time[1] - time[0] < MINSPEECHGLITCH)) {
                start = (int)abs(jump[0]);
                end   = (int)abs(jump[1]);
                k = start;
                if(octglitch > 0) {
                    while(k < end) {
                        pitchdata[k] /= 2.0;
                        k += 2;
                    }
                } else {
                    while(k < end) {
                        pitchdata[k] *= 2.0;
                        k += 2;
                    }
                }
                jumpcnt = 0;
            } else {
                jump[0] = jump[1];
                time[0] = time[1];
                jumpcnt = 1;
            }
        }
        n += 2;
        m += 2;
    }
    if(jumpcnt) {       
        if(time[0] < MINSPEECHGLITCH) {                                     // SINGLE LEAP AT START
            k = 1;
            end = (int)abs(jump[0]);
            if(jump[0] > 0) {
                while(k < end) {
                    pitchdata[k] *= 2.0;
                    k += 2;
                }
            } else {
                while(k < end) {
                    pitchdata[k] /= 2.0;
                    k += 2;
                }
            }
        } else if(pitchdata[endtime_index] - time[0] < MINSPEECHGLITCH)  {  // SINGLE LEAP LEFT AT END
            k = (int)abs(jump[0]);
            end = datalen;
            if(jump[0] > 0) {
                while(k < end) {
                    pitchdata[k] /= 2.0;
                    k += 2;
                }
            } else {
                while(k < end) {
                    pitchdata[k] *= 2.0;
                    k += 2;
                }
            }
        }
    }
}

/*************************** GETMAXSAMPR ******************************/

float getmaxsampr(int startsamp, int sampcnt,float *buffer)
{
    int  i, endsamp = startsamp + sampcnt;
    float thisval, thismaxsamp = -1;
    for(i = startsamp; i<endsamp; i++) {
        if((thisval = (float)fabs(buffer[i]))>thismaxsamp)
            thismaxsamp = thisval;
    }
    return(thismaxsamp);
}

/**************************** READ_VALIDPITCH_WSIZE_IN_SAMPS_FROM_BRKTABLE *****************************/

int read_validpitch_wsize_in_samps_from_brktable(double thistime,int kk,dataptr dz)
{
    double dnval = 0.0, upval = 0.0, val, time;
    double diff, mindiff = HUGE;
    double dntimediff = -1.0, uptimediff = -1.0;
    int n, m, wsize, here = 0;
    for(n = 0,m = 0;n < dz->brksize[kk];n++,m+=2) {
        time = dz->brk[kk][m];
        if((diff = fabs(time - thistime)) < mindiff) {
            mindiff = diff;
            here = m;
        }
        n++;
    }
    time = dz->brk[kk][here];
    val  = dz->brk[kk][here+1];
    if(val <= 0.0) {    /* no pitch */
        m = here;
        m -= 2;
        while(m >= 0) {
            if((dnval = dz->brk[kk][m+1]) > 0.0) {
                dntimediff = time - dz->brk[kk][m];
                break;
            }
            m -= 2;

        }
        m = here;
        m += 2;
        while(m < (dz->brksize[kk] * 2)) {
            if((upval = dz->brk[kk][m+1]) > 0.0) {
                uptimediff = dz->brk[kk][m] - time;
                break;
            }
            m += 2;
        }
        if(dntimediff < 0.0)
            val = upval;
        else if(uptimediff < 0.0)
            val = dnval; 
        else if(uptimediff < dntimediff)
            val = upval;
        else
            val = dnval; 
    }
    wsize = (int)round((double)dz->infile->srate/val);
    return wsize;
}

/**************************** NEXT_ZERO_CROSS *****************************/

int next_zero_cross(int here,dataptr dz)
{
    float *buf = dz->sampbuf[0];
    float val = buf[here];
    while((val = buf[here]) >= 0.0)
        here++;
    return here;
}

/**************************** PREVIOUS_ZERO_CROSS *****************************/

int previous_zero_cross(int here,int firstzero,dataptr dz)
{
    float *buf = dz->sampbuf[0];
    float val;
    while((val = buf[here]) < 0.0) {
        here--;
        if(here <= firstzero)
            return firstzero;
    }
    here++;
    return here;
}

/******************************** AUTO_CORRELATE ********************************
 *                 *at
 *               (cut to               search    realend
 *     start      adjust)               end      of 3segs
 *       ___________ ______ _____________i___________
 *      |           |      |             i          |
 *                                       i
 *
 *
 *
 *  start    = start of the segment.
 *  end      = end of the search area for correlation between segs.
 *  *at      = starts out as the original cut position, and may be changed by this process.
 *  realend  = end of the group of 3 segs: if no cutsite found before 'end', extend search towards 'realend'
 *            (cutsites are always at downward-crossing zeros)
 *  minlen   = minimum length of adjacent stretches of sound to compare
 *  pitchseg = length of seg corresponding to pitch (if any) at this place.
 *             if the new cutpoint is further from the pitchseg val than the original cut (*at)
 *             the search can be restricted to a smaller range then defiend by 'end'.
 */
int auto_correlate(int start,int *at,int end,int realend,int minlen,double pitchseg,int kk,dataptr dz)
{
    float *buf = dz->sampbuf[0];
    int startbuf = 0, startinbuf, atinbuf, orig_atinbuf, maxinbuf, n, m, oldlen, newlen;
    int newlen2=0, atinbuf2, orig_maxinbuf;
    double max_auto, max_auto2, thisauto, time;
    int finished, unpitched = 0, extended = 0;
    if(end > dz->total_samps_read) {
        if((sndseekEx(dz->ifd[kk],start,0)<0)){
            sprintf(errstr,"sndseek() failed\n");
            return SYSTEM_ERROR;
        }
        dz->total_samps_read = start;
        dz->samps_left       = dz->insams[kk] - start;
        if((dz->ssampsread = fgetfbufEx(dz->sampbuf[0], dz->buflen,dz->ifd[kk],0)) < 0) {
            sprintf(errstr,"Can't read samples from input soundfile %d\n",kk+1);
            return(SYSTEM_ERROR);
        }
        dz->total_samps_read += dz->ssampsread;
        dz->samps_left -= dz->ssampsread;
    }
//NEW
    startbuf = dz->total_samps_read - dz->ssampsread;
    startinbuf = start - startbuf; 
    atinbuf    = *at   - startbuf;
    maxinbuf   = end   - startbuf;
    orig_atinbuf  = atinbuf;
    orig_maxinbuf = maxinbuf;
    finished = 0;
//  oldlen = *at - startinbuf;
    oldlen = atinbuf - startinbuf;
    do {
        while(!finished) {
            atinbuf2 = -1;
            n = startinbuf;
            m = startinbuf + minlen;
            m = next_down_zcross(m,maxinbuf,buf);   /* starting with a segment which ends at first down_zcross after minlen */
            if(m > maxinbuf || m < 0)
                break;
            max_auto = autocorrelate(n,m,buf);      /* autocorrelate two minsize segments */
            max_auto2 = max_auto;
            atinbuf = m;
            for(;;) {                               /* gradually expand size to next (etc) down_zcross, & autocorrelate */
                if((m = next_down_zcross(m,maxinbuf,buf)) < 0)
                    break;
                if((thisauto = autocorrelate(n,m,buf)) > max_auto) {
                    max_auto = thisauto;
                    atinbuf = m;
                } else if(thisauto > max_auto2) {
                    max_auto2 = thisauto;
                    atinbuf2 = m;                   /* Save best and 2nd best lengths (tested by correlation) */
                }
            }       
            if(pitchseg < 0.0) {                    /* If an unpitched seg, use closest pitch to set arbitrary 'ideal' seg size */
                unpitched = 1;
                time = (double)(*at)/(double)dz->infile->srate;
                pitchseg = (double)read_validpitch_wsize_in_samps_from_brktable(time,kk,dz);
            }
            newlen = atinbuf - startinbuf;
            if(atinbuf2 >= 0)
                newlen2 = atinbuf2 - startinbuf;
            *at = atinbuf + startbuf;   /* Compare best-correlated  cuts, with existing cut */
            if(fabs((double)newlen - pitchseg) <= fabs((double)oldlen - pitchseg)) {
                if(atinbuf2 >= 0) {     /* If 2nd best correlation point exists & is closer to pitch than best, use it */
                    if(fabs((double)newlen2 - pitchseg) < fabs((double)newlen - pitchseg))
                        *at = atinbuf2 + startbuf;  
                }                       /* Else, If best new value is closer to pitch than original: use it */
                return FINISHED;
                                        /* If best cut(s) are worse than existing cut, */   
            } else if(extended) {       /* if already EXTENDED the search, no point in looking at smaller range */
                *at = orig_atinbuf + startbuf;  /* Reset, and break from inner ('while') loop */
                break;                  
            } else {                    /* Otherwise, set end of search to the down_zcross PRIOR to the one found */
                maxinbuf = last_down_zcross(maxinbuf,startinbuf,buf);
                if(maxinbuf <= 0) {     /* If can't get any smaller, break from inner 'while' loop */
                    *at = orig_atinbuf + startbuf;
                    break;
                }                       /* Otherwise continue search in 'while' loop */
            }       
            if(unpitched)
                pitchseg = -1.0;
        }                               /* If inner loop search has failed */
        if(end < realend) {             /* if the search end is less than the realend of the 3segments, EXTEND the search */    
            maxinbuf = next_down_zcross(orig_maxinbuf,dz->buflen,buf);
            if(maxinbuf < 0)
                break;
            end = maxinbuf + startbuf;
            orig_maxinbuf = maxinbuf;
            extended = 1;
        }
    } while(end < realend);
    return FINISHED;
}

/******************************** AUTOCORRELATE ********************************/

double autocorrelate(int n,int m,float *buf)
{
    int j, k;
    double sum = 0.0;
    for(j = n,k = m;j<m;j++,k++)
        sum += (buf[j] * buf[k]);
    sum = sum/(double)(m-n);
    return sum;
}

/******************************** NEXT_DOWN_ZCROSS ********************************/

int next_down_zcross(int here,int hibound,float *buf)
{   
    double val = buf[here];
    while(val <= 0.0) {
        here++;
        if(here >= hibound)
            return -1;
        val = buf[here];
    }
    while(val > 0.0) {
        here++;
        if(here >= hibound)
            return -1;
        val = buf[here];
    }
    return here;
}

/******************************** LAST_DOWN_ZCROSS ********************************/

int last_down_zcross(int here,int lobound,float *buf)
{   
    double val = buf[here];
    while(val <= 0.0) {
        here--;
        if(here < lobound)
            return -1;
        val = buf[here];
    }
    while(val >= 0.0) {
        here--;
        if(here < lobound)
            return -1;
        val = buf[here];
    }
    while(val < 0.0) {
        here--;
        if(here < lobound)
            return -1;
        val = buf[here];
    }
    here++;
    return here;
}